Difference between revisions of "Neural System - Postnatal"

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{{Header}}
 
==Introduction==
 
==Introduction==
 
[[File:WHO_motor_development_milestones.jpg|thumb|WHO motor development milestones]]
 
[[File:WHO_motor_development_milestones.jpg|thumb|WHO motor development milestones]]
 +
[[File:CDC postnatal milestones.jpg|thumb|CDC postnatal milestones]]
 +
The human nervous system continues to develop postnatally mostly in glial (white matter) proliferation and in neurons (grey matter) making new connections and remodelling.
  
{{Template:Neural Links}} | [[Neonatal Development]] | [http://embryology.med.unsw.edu.au/Child/page7.htm original page]
+
In humans, postnatal neurogenesis occurs only in specialised niches within the; rostral sub ventricular zone of lateral ventricles, hippocampal dentate gyrus (subgranular zone), within white matter tracts and external granular layer of the cerebellum.
 +
 
 +
Some recent studies are now using [[Magnetic Resonance Imaging|MRI techniques]] to measure the differences between [[Birth - Preterm|preterm]] and normal term birth neural development based upon cortical folding.{{#pmid:26550941|PMID26550941}}
 +
 
 +
 
 +
{{Neural Links}} | [[Neonatal Development]]
 +
 
 +
==Some Recent Findings==
 +
{|
 +
|-bgcolor="F5FAFF"
 +
|
 +
* '''Dynamic changes in ultrastructure of the primary cilium in migrating neuroblasts in the postnatal brain'''{{#pmid:31685650|PMID31685650}} "New neurons, referred to as neuroblasts, are continuously generated in the ventricular-subventricular zone of the brain throughout an animal's life. These neuroblasts are characterized by their unique potential for proliferation, formation of chain-like cell aggregates, and long-distance and high-speed migration through the rostral migratory stream (RMS) toward the {{olfactory bulb}} (OB), where they decelerate and differentiate into mature interneurons. ... Together, our results highlight a close mutual relationship between spatiotemporal regulation of the primary cilium and efficient chain migration of neuroblasts in the postnatal brain. Immature neurons (neuroblasts) generated in the postnatal brain have a mitotic potential and migrate in chain-like cell aggregates toward the olfactory bulb. Here we report that migrating neuroblasts possess a tiny cellular protrusion called a primary cilium. Immunohistochemical studies with zebrafish, mouse, and monkey brains suggest that the presence of the primary cilium in migrating neuroblasts is evolutionarily conserved. Ciliogenesis in migrating neuroblasts in the RMS is suppressed during mitosis and promoted after cell cycle exit. Moreover, live imaging and three-dimensional electron microscopy revealed that ciliary localization and orientation change during saltatory movement of neuroblasts. Our results reveal highly organized dynamics in maturation and positioning of the primary cilium during neuroblast migration that underlie saltatory movement of postnatal-born neuroblasts." {{smell}
 +
 
 +
*'''Shaping the adult brain with exercise during development: Emerging evidence and knowledge gaps'''{{#pmid:31229526|PMID31229526}}  "Exercise is known to produce a myriad of positive effects on the brain, including increased glia, neurons, blood vessels, white matter and dendritic complexity. Such effects are associated with enhanced cognition and stress resilience in humans and animal models. As such, exercise represents a positive experience with tremendous potential to influence brain development and shape an adult brain capable of responding to life's challenges. Although substantial evidence attests to the benefits of exercise for cognition in children and adolescents, the vast majority of existing studies examine acute effects. Nonetheless, there is emerging evidence indicating that exercise during development has positive cognitive and neural effects that last to adulthood. There is, therefore, a compelling need for studies designed to determine the extent to which plasticity driven by developmental exercise translates into enhanced brain health and function in adulthood and the underlying mechanisms. Such studies are particularly important given that modern Western society is increasingly characterized by sedentary behavior, and we know little about how this impacts the brain's developmental trajectory. This review synthesizes current literature and outlines significant knowledge gaps that must be filled in order to elucidate what exercise (or lack of exercise) during development contributes to the health and function of the adult brain."
 +
 
 +
* '''An In Vivo Three-Dimensional Magnetic Resonance Imaging-Based Averaged Brain Collection of the Neonatal Piglet'''{{#pmid:25254955|PMID25254955}} "Due to the fact that morphology and perinatal growth of the piglet brain is similar to humans, use of the piglet as a translational animal model for neurodevelopmental studies is increasing. Magnetic resonance imaging (MRI) can be a powerful tool to study neurodevelopment in piglets, but many of the MRI resources have been produced for adult humans. Here, we present an average in vivo MRI-based atlas specific for the 4-week-old piglet." (More? {{Pig}} | [[Magnetic Resonance Imaging]])
 +
|}
 +
{| class="wikitable mw-collapsible mw-collapsed"
 +
! More recent papers  
 +
|-
 +
| [[File:Mark_Hill.jpg|90px|left]] {{Most_Recent_Refs}}
 +
 
 +
Search term: [http://www.ncbi.nlm.nih.gov/pubmed/?term=Postnatal+Neural+Development ''Postnatal Neural Development'']
 +
 
 +
|}
 +
{| class="wikitable mw-collapsible mw-collapsed"
 +
! Older papers  
 +
|-
 +
| {{Older papers}}
 +
* '''Perturbed neural activity disrupts cerebral angiogenesis during a postnatal critical period.'''{{#pmid:24305053|PMID24305053}} "During the neonatal period, activity-dependent neural-circuit remodelling coincides with growth and refinement of the cerebral microvasculature. Whether neural activity also influences the patterning of the vascular bed is not known. Here we show in neonatal mice, that neither reduction of sensory input through whisker trimming nor moderately increased activity by environmental enrichment affects cortical microvascular development. ...Therefore, excessive sensorimotor stimulation and repetitive neural activation during early childhood may cause lifelong deficits in microvascular reserve, which could have important consequences for brain development, function and pathology."
 +
 
 +
* '''The temporal pattern of postnatal neurogenesis found in the neocortex of the Göttingen mini pig brain'''{{#pmid:21878372|PMID21878372}}  "The Göttingen minipig (G-mini) is increasingly used as a non-primate model for human neurological diseases. We applied design-based stereology on five groups of G-minis aged 1 day, 14 days, 30 days, 100 days, and 2 years or older to estimate the pattern of postnatal neuron number development in the neocortex. ... Since neurogenesis and neuronal migration in the human neocortex are generally accepted to be complete before term, the application of G-mini as human disease models may be inappropriate before day 100. However, G-mini may serve as a valuable model for the studies of ongoing neurogenesis in the living brain."
 +
 
 +
* '''Secreted semaphorins control spine distribution and morphogenesis in the postnatal CNS'''{{#pmid:20010807|PMID20010807}} "The majority of excitatory synapses in the mammalian CNS (central nervous system) are formed on dendritic spines, and spine morphology and distribution are critical for synaptic transmission, synaptic integration and plasticity. Here, we show that a secreted semaphorin, Sema3F, is a negative regulator of spine development and synaptic structure."
 +
 
 +
|}
 +
==Cortex Development==
 +
Recent NIH research has looked at the postnatal development of the cortex in children ([http://www.nih.gov/news/pr/mar2006/nimh-29.htm Cortex Matures Faster in Youth with Highest IQ])
 +
:"The researchers found that the relationship between cortex thickness and IQ varied with age, particularly in the prefrontal cortex, seat of abstract reasoning, planning, and other "executive" functions. .... While the cortex was thinning in all groups by the teen years, the superior group showed the highest rates of change."
 +
 
 +
[[File:Postnatal_cortex_development_trajectory.jpg]]
 +
 
 +
The developmental trajectory in cortex thickness differs as the brain matures in different IQ groups. Thickness of the area at the top/front/center, highlighted in MRI brain maps at left, peaks relatively late, at age 12 (blue arrow), in youth with superior intelligence, perhaps reflecting an extended critical period for development of high-level cognitive circuits. (Image and text source: NIMH Child Psychiatry Branch)
 +
 
 +
==Human Tract Development==
 +
 
 +
[[File:Human brain white matter tracts.png|600px]]
 +
 
 +
MRI diffusion tensor imaging (DTI) provides information on white matter microstructure, including fractional anisotropy (FA).<ref>Imperati D, Colcombe S, Kelly C, Di Martino A, Zhou J, et al. (2011) Differential Development of Human Brain White Matter Tracts. PLoS ONE 6(8): e23437. doi:10.1371/journal.pone.0023437 [http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0023437 PloS One]</ref>
 +
 
 +
 
 +
 
 +
==Hippocampus - Dentate Gyrus==
 +
There are a number of different markers<ref>PMID 21647561</ref> that can be used to identify hippocampal developmental changes:
 +
* proliferative events - PCNA, Ki-67, PH3, MCM2
 +
* early phases of neurogenesis and gliogenesis - nestin, GFAP, Sox2, Pax6
 +
* gliogenesis - vimentin, BLBP, S100beta
 +
* neurogenesis - NeuroD, PSA-NCAM, DCX
 +
 
 +
==Lateral Ventricle - Subventricular Zone==
 +
 
 +
==Neurological Assessment==
 +
There are many different neurological assessment tests that have been designed over the years using a number of motor and intelligence (comprehension) skill tests. Some of these assessment tests are applicable to specific early neurological development ages. PD Larsen and SS Stensaas from the Utah School of Medicine have also made a series of movies demonstrating normal postnatal neurological development assessment.
 +
 
 +
===Neonatal===
 +
 
 +
* '''Test of Infant Motor Performance''' (TIMP) can be used in very early development (from 32 weeks post-conceptional age to 4 months post-term). Involves observation of 28 items and elicitation of 31 items measures behaviours of functional relevance.
 +
* '''Einstein Neonatal Neurobehavioral Assessment Scale'''
 +
* '''Neurobehavioral Assessment of the Preterm Infant'''
 +
* '''Bayley Scales of Infant Development''' (BSID) a postnatal (from 1 to 42 months) neurological assessment scale used in screening and diagnosis of development using 178 item mental scale and the 111 item motor scale, the original BSID was revised in 1993 to version 2 (BSID-II).
 +
* '''Peabody Developmental Motor Scale II''' (PDMS-2) tests a child’s motor competence relative to his or her peers. Involves a series of evaluations: reflexes (8 items), stationary/nonlocomotor (30 items), locomotion (89 items), object manipulation (24 items), grasping (26 items) and visual-motor integration (72 items).
 +
 
 +
===Infant===
 +
 
 +
* '''Alberta Infant Motor Scale''' (AIMS) birth to 18 months. Identify infants with motor delay (discrimination) and evaluates motor development over time.
 +
* '''Battelle Developmental Inventory Screening Test''' (BDIST) for children 6 months to 8 years old.
 +
* '''Brief Assessment of Motor Function''' (BAMF) is a series of 10-point ordinal scales developed for rapid description of gross motor, fine motor, and oral motor performance.
 +
* '''Fagan Test of Infant Intelligence''' (FTII)
 +
* '''Comprehensive Developmental Inventory for Infants and Toddlers''' (CDIIT) a developmental test designed in Taiwan.
 +
* '''Denver-II''' (CDIIT) a historic test redesigned as a version 2, for 3 and 72 months of age. It has been suggested that the test may require additional revision for better accuracy.
 +
* '''Bruininks-Oseretsky Test of Motor Proficiency''' (1978) ages 4.5 to 14.5 years.
 +
* '''Early Language Milestone Scale-2''', Early Intervention Developmental Profile (EIDP), Gross Motor Function Measure (GMFM)
 +
 
 +
There are also a range of task based tests: Means-End Problem-Solving Task, Operant Discrimination Learning, Mobile/Train Conjugate Reinforcement Tasks, The Transparent Barrier Detour Task, The A-not-B Task
  
 
==Postnatal Neural Examination==
 
==Postnatal Neural Examination==
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Additional postnatal movies are available on the [[Neural Exam Movies]] page.
 
Additional postnatal movies are available on the [[Neural Exam Movies]] page.
  
===Newborn normal===
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===Newborn Normal===
 
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===Newborn abnormal===
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===Newborn Abnormal===
 
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|-
 
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|-
 
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==Autism==
  
==Related Images==
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Autism (autism spectrum disorder, ASD) is a behaviourally defined brain disorder in children. Features include: impoverished verbal and non-verbal communication skills, reduced social interactions (bias their attention towards objects rather than the surrounding social situation), behavioural impairments in attention engagement/disengagement, poor emotional discrimination and facial recognition, and fail to response to their own names. There exist many different and unproven claims as to the origins of autism.
 +
 
 +
Developmentally associated with neural maturation changes in cortical thickness and organization, and particularly affecting pyramidal neurons. A rat model shows structural and behavioural features of autism as a result of altering the trajectory of early postnatal cortical development.<ref>Chomiak T, Karnik V, Block E, Hu B. '''Altering the trajectory of early postnatal cortical development can lead to structural and behavioural features of autism.''' BMC Neurosci. 2010 Aug 19;11:102.
 +
[http://www.ncbi.nlm.nih.gov/pubmed/20723245 PMID: 20723245]| [http://www.biomedcentral.com/1471-2202/11/102 BMC Neurosci.]</ref>
 +
 
 +
 
 +
==Additional Images==
 
<gallery>
 
<gallery>
 
File:Dev_anat_02.jpg
 
File:Dev_anat_02.jpg
Line 53: Line 146:
 
</gallery>
 
</gallery>
  
==References==
+
==Magnetic Resonance Imaging of Neural Growth==
===Developmental changes in cerebral grey and white matter volume from infancy to adulthood.===
+
[[File:Brain_ventricles_and_ganglia_development_03.jpg|thumb|Human brain and ventricular development imaged by MRI<ref name="PMID20108226"><pubmed>20108226</pubmed></ref>]]
  
Int J Dev Neurosci. 2010 Oct;28(6):481-9. Epub 2010 Jun 30.
+
There are a growing number of magnetic resonance imaging (MRI) studies of brain development.
Groeschel S, Vollmer B, King MD, Connelly A.
 
  
Radiology and Physics Unit, UCL Institute of Child Health, London, UK. s.groeschel@gmx.org
+
'''3 months to 30 years - Changes in cerebral grey and white matter volume from infancy to adulthood'''<ref><pubmed>20600789</pubmed></ref>
Abstract
+
* images of 158 normal subjects from infancy to young adulthood were studied (age range 3 months-30 years, 71 males, 87 females).
 +
* volume measures of whole brain, grey matter (GM) and white matter (GM) and gender-specific development
 +
* The resulting growth curve parameter estimates lead to the following observations: total brain volume is demonstrated to undergo an initial rapid spurt. The total GM volume peaks during childhood and decreases thereafter, whereas total WM volume increases up to young adulthood.  
 +
* Relative to brain size, GM decreases and WM increases markedly over this age range in a non-linear manner, resulting in an increasing WM-to-GM ratio over much of the observed age range.  
 +
* Significant gender differences brain volume and total white and grey matter volume are larger in males than in females, with a time-dependent difference over the age range studied. Over part of the observed age range females tend to have more GM volume relative to brain size and lower WM-to-GM ratio than males.  
  
In order to quantify human brain development in vivo, high resolution magnetic resonance images of 158 normal subjects from infancy to young adulthood were studied (age range 3 months-30 years, 71 males, 87 females). Data were analysed using algorithms based on voxel-based morphometry (VBM) (an objective whole brain processing technique) to generate global volume measures of whole brain, grey matter (GM) and white matter (GM). Gender-specific development of WM and GM volumes is characterised using a piecewise polynomial growth curve model to account for the non-linear nature of human brain development, implemented using Markov chain Monte Carlo simulation. The statistical method employed in this study proved to be successful and robust in the characterisation of brain development. The resulting growth curve parameter estimates lead to the following observations: total brain volume is demonstrated to undergo an initial rapid spurt. The total GM volume peaks during childhood and decreases thereafter, whereas total WM volume increases up to young adulthood. Relative to brain size, GM decreases and WM increases markedly over this age range in a non-linear manner, resulting in an increasing WM-to-GM ratio over much of the observed age range. In addition, significant gender differences are found. In general, brain volume and total white and grey matter volume are larger in males than in females, with a time-dependent difference over the age range studied. Over part of the observed age range females tend to have more GM volume relative to brain size and lower WM-to-GM ratio than males. The presented findings should be taken into account when investigating physiological and pathological changes during brain development.
+
'''8 to 30 years - Subcortical brain development'''<ref><pubmed>19776264</pubmed></ref>
 +
* Brain development during late childhood and adolescence is characterized by decreases in gray matter (GM) and increases in white matter (WM) and ventricular volume.
 +
* developmental trajectories of 16 neuroanatomical volumes in the same sample of children, adolescents, and young adults (n = 171; range, 8-30 years).  
 +
* The results revealed substantial heterogeneity in developmental trajectories. GM decreased nonlinearly in the cerebral cortex and linearly in the caudate, putamen, pallidum, accumbens, and cerebellar GM, whereas the amygdala and hippocampus showed slight, nonlinear increases in GM volume. WM increased nonlinearly in both the cerebrum and cerebellum, with an earlier maturation in cerebellar WM.
 +
* Differences between structures within the same regions: among the basal ganglia, the caudate showed a weaker relationship with age than the putamen and pallidum, and in the cerebellum, differences were found between GM and WM development.  
  
http://www.ncbi.nlm.nih.gov/pubmed/20600789
+
'''Birth to 2 years - Human brain development'''<ref><pubmed>19020011</pubmed></ref>
 +
* Ninety-eight children received structural MRI scans: 84 children at 2-4 weeks, 35 at 1 year and 26 at 2 years of age.
 +
* total brain volume increased 101% in the first year, with a 15% increase in the second.
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* majority of hemispheric growth was accounted for by gray matter, which increased 149% in the first year
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* hemispheric white matter volume increased by only 11%.  
 +
* Cerebellum volume increased 240% in the first year.  
 +
* Lateral ventricle volume increased 280% in the first year, with a small decrease in the second.  
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* caudate increased 19% and the hippocampus 13% from age 1 to age 2.
 +
* Cerebellum volume also increased substantially in the first year of life.
  
  
===Heterogeneity in subcortical brain development: A structural magnetic resonance imaging study of brain maturation from 8 to 30 years.===
 
  
J Neurosci. 2009 Sep 23;29(38):11772-82.
 
  
Ostby Y, Tamnes CK, Fjell AM, Westlye LT, Due-Tønnessen P, Walhovd KB.
+
:'''Links:''' [[Magnetic Resonance Imaging]]
  
Center for the Study of Human Cognition, Department of Psychology, University of Oslo, Norway. ylva.ostby@psykologi.uio.no
+
== References ==
Abstract
+
<references/>
Brain development during late childhood and adolescence is characterized by decreases in gray matter (GM) and increases in white matter (WM) and ventricular volume. The dynamic nature of development across different structures is, however, not well understood, and the present magnetic resonance imaging study took advantage of a whole-brain segmentation approach to describe the developmental trajectories of 16 neuroanatomical volumes in the same sample of children, adolescents, and young adults (n = 171; range, 8-30 years). The cerebral cortex, cerebral WM, caudate, putamen, pallidum, accumbens area, hippocampus, amygdala, thalamus, brainstem, cerebellar GM, cerebellar WM, lateral ventricles, inferior lateral ventricles, third ventricle, and fourth ventricle were studied. The cerebral cortex was further analyzed in terms of lobar thickness and surface area. The results revealed substantial heterogeneity in developmental trajectories. GM decreased nonlinearly in the cerebral cortex and linearly in the caudate, putamen, pallidum, accumbens, and cerebellar GM, whereas the amygdala and hippocampus showed slight, nonlinear increases in GM volume. WM increased nonlinearly in both the cerebrum and cerebellum, with an earlier maturation in cerebellar WM. In addition to similarities in developmental trajectories within subcortical regions, our results also point to differences between structures within the same regions: among the basal ganglia, the caudate showed a weaker relationship with age than the putamen and pallidum, and in the cerebellum, differences were found between GM and WM development. These results emphasize the importance of studying a wide range of structural variables in the same sample, for a broader understanding of brain developmental principles.
+
 
 +
===Reviews===
 +
 
 +
{{#pmid:20354534}}
  
http://www.ncbi.nlm.nih.gov/pubmed/19776264 http://www.jneurosci.org/cgi/content/full/29/38/11772
+
{{#pmid:20097213}}
  
===A structural MRI study of human brain development from birth to 2 years.===
+
{{#pmid:19932467}}
Knickmeyer RC, Gouttard S, Kang C, Evans D, Wilber K, Smith JK, Hamer RM, Lin W, Gerig G, Gilmore JH.
 
J Neurosci. 2008 Nov 19;28(47):12176-82.
 
PMID: 19020011
 
  
===Critical Periods of Human Development===
+
{{#pmid:19630577}}
  
Exposure to teratogens during these "critical periods" results in specific abnormalities. [http://embryology.med.unsw.edu.au/Medicine/images/hcriticaldev.gif Critical Periods]
+
{{#pmid:15121991}}
* most systems are susceptible during embryonic development (first trimester)
 
* the earlier the exposure the more severe the effects
 
* each system has a different critical period
 
* longest critical periods
 
** longest developing systems (neural, genital)
 
** complicated developmental origins (sensory systems)
 
  
== References ==
+
===Articles===
===Textbooks===
 
* '''The Developing Human: Clinically Oriented Embryology''' (8th Edition) by Keith L. Moore and T.V.N Persaud - Mesoderm Ch15,16: p405-423, 426-430 Body Cavities Ch9: p174-184
 
* '''Larsen’s Human Embryology''' by GC. Schoenwolf, SB. Bleyl, PR. Brauer and PH. Francis-West -  Mesoderm Ch11 p311-339 Body Cavities Ch6 p127-146
 
  
Additional Textbooks
 
* Before We Are Born (5th ed.) Moore and Persaud Ch16,17: p379-397, 399-405
 
* Essentials of Human Embryology Larson Ch11 p207-228
 
* Human Embryology Fitzgerald and Fitzgerald Body Cavities Ch5 p29-32, Ch7 p47,48
 
* Human Embryology and Developmental Biology ?Carlson Ch9,10: p173-193, 209-222 Body Cavities Ch5 p29-32, Ch7 p47,48
 
  
===Search ===
+
===Search PubMed===
  
* '''Bookshelf'''  [http://www.ncbi.nlm.nih.gov/sites/entrez?db=Books&cmd=search&term=postnatal%20neural%20development postnatal neural 0development]  
+
'''Search Bookshelf'''  [http://www.ncbi.nlm.nih.gov/sites/entrez?db=Books&cmd=search&term=postnatal%20neural%20development postnatal neural development]  
  
* '''Pubmed''' [http://www.ncbi.nlm.nih.gov/sites/gquery?itool=toolbar&cmd=search&term=postnatal%20neural%20development postnatal neural development]  
+
'''Search Pubmed''' [http://www.ncbi.nlm.nih.gov/sites/entrez?db=pubmed&cmd=search&term=postnatal%20neural%20development postnatal neural development] |  [http://www.ncbi.nlm.nih.gov/sites/entrez?db=pubmed&cmd=search&term=postnatal%20Dentate%20Gyrus postnatal Dentate Gyrus] |  [http://www.ncbi.nlm.nih.gov/sites/entrez?db=pubmed&cmd=search&term=postnatal%20Subventricular%20Zone postnatal Subventricular Zone] | [http://www.ncbi.nlm.nih.gov/sites/entrez?db=pubmed&cmd=search&term=autism autism]  
  
  
 
{{Template:Glossary}}
 
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Introduction

WHO motor development milestones
CDC postnatal milestones

The human nervous system continues to develop postnatally mostly in glial (white matter) proliferation and in neurons (grey matter) making new connections and remodelling.

In humans, postnatal neurogenesis occurs only in specialised niches within the; rostral sub ventricular zone of lateral ventricles, hippocampal dentate gyrus (subgranular zone), within white matter tracts and external granular layer of the cerebellum.

Some recent studies are now using MRI techniques to measure the differences between preterm and normal term birth neural development based upon cortical folding.[1]


Neural Links: ectoderm | neural | neural crest | ventricular | sensory | Stage 22 | gliogenesis | neural fetal | Medicine Lecture - Neural | Lecture - Ectoderm | Lecture - Neural Crest | Lab - Early Neural | neural abnormalities | folic acid | iodine deficiency | Fetal Alcohol Syndrome | neural postnatal | neural examination | Histology | Historic Neural | Category:Neural

| Neonatal Development

Some Recent Findings

  • Dynamic changes in ultrastructure of the primary cilium in migrating neuroblasts in the postnatal brain[2] "New neurons, referred to as neuroblasts, are continuously generated in the ventricular-subventricular zone of the brain throughout an animal's life. These neuroblasts are characterized by their unique potential for proliferation, formation of chain-like cell aggregates, and long-distance and high-speed migration through the rostral migratory stream (RMS) toward the olfactory bulb (OB), where they decelerate and differentiate into mature interneurons. ... Together, our results highlight a close mutual relationship between spatiotemporal regulation of the primary cilium and efficient chain migration of neuroblasts in the postnatal brain. Immature neurons (neuroblasts) generated in the postnatal brain have a mitotic potential and migrate in chain-like cell aggregates toward the olfactory bulb. Here we report that migrating neuroblasts possess a tiny cellular protrusion called a primary cilium. Immunohistochemical studies with zebrafish, mouse, and monkey brains suggest that the presence of the primary cilium in migrating neuroblasts is evolutionarily conserved. Ciliogenesis in migrating neuroblasts in the RMS is suppressed during mitosis and promoted after cell cycle exit. Moreover, live imaging and three-dimensional electron microscopy revealed that ciliary localization and orientation change during saltatory movement of neuroblasts. Our results reveal highly organized dynamics in maturation and positioning of the primary cilium during neuroblast migration that underlie saltatory movement of postnatal-born neuroblasts." {{smell}
  • Shaping the adult brain with exercise during development: Emerging evidence and knowledge gaps[3] "Exercise is known to produce a myriad of positive effects on the brain, including increased glia, neurons, blood vessels, white matter and dendritic complexity. Such effects are associated with enhanced cognition and stress resilience in humans and animal models. As such, exercise represents a positive experience with tremendous potential to influence brain development and shape an adult brain capable of responding to life's challenges. Although substantial evidence attests to the benefits of exercise for cognition in children and adolescents, the vast majority of existing studies examine acute effects. Nonetheless, there is emerging evidence indicating that exercise during development has positive cognitive and neural effects that last to adulthood. There is, therefore, a compelling need for studies designed to determine the extent to which plasticity driven by developmental exercise translates into enhanced brain health and function in adulthood and the underlying mechanisms. Such studies are particularly important given that modern Western society is increasingly characterized by sedentary behavior, and we know little about how this impacts the brain's developmental trajectory. This review synthesizes current literature and outlines significant knowledge gaps that must be filled in order to elucidate what exercise (or lack of exercise) during development contributes to the health and function of the adult brain."
  • An In Vivo Three-Dimensional Magnetic Resonance Imaging-Based Averaged Brain Collection of the Neonatal Piglet[4] "Due to the fact that morphology and perinatal growth of the piglet brain is similar to humans, use of the piglet as a translational animal model for neurodevelopmental studies is increasing. Magnetic resonance imaging (MRI) can be a powerful tool to study neurodevelopment in piglets, but many of the MRI resources have been produced for adult humans. Here, we present an average in vivo MRI-based atlas specific for the 4-week-old piglet." (More? pig | Magnetic Resonance Imaging)
More recent papers  
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Search term: Postnatal Neural Development

Older papers  
These papers originally appeared in the Some Recent Findings table, but as that list grew in length have now been shuffled down to this collapsible table.

See also the Discussion Page for other references listed by year and References on this current page.

  • Perturbed neural activity disrupts cerebral angiogenesis during a postnatal critical period.[5] "During the neonatal period, activity-dependent neural-circuit remodelling coincides with growth and refinement of the cerebral microvasculature. Whether neural activity also influences the patterning of the vascular bed is not known. Here we show in neonatal mice, that neither reduction of sensory input through whisker trimming nor moderately increased activity by environmental enrichment affects cortical microvascular development. ...Therefore, excessive sensorimotor stimulation and repetitive neural activation during early childhood may cause lifelong deficits in microvascular reserve, which could have important consequences for brain development, function and pathology."
  • The temporal pattern of postnatal neurogenesis found in the neocortex of the Göttingen mini pig brain[6] "The Göttingen minipig (G-mini) is increasingly used as a non-primate model for human neurological diseases. We applied design-based stereology on five groups of G-minis aged 1 day, 14 days, 30 days, 100 days, and 2 years or older to estimate the pattern of postnatal neuron number development in the neocortex. ... Since neurogenesis and neuronal migration in the human neocortex are generally accepted to be complete before term, the application of G-mini as human disease models may be inappropriate before day 100. However, G-mini may serve as a valuable model for the studies of ongoing neurogenesis in the living brain."
  • Secreted semaphorins control spine distribution and morphogenesis in the postnatal CNS[7] "The majority of excitatory synapses in the mammalian CNS (central nervous system) are formed on dendritic spines, and spine morphology and distribution are critical for synaptic transmission, synaptic integration and plasticity. Here, we show that a secreted semaphorin, Sema3F, is a negative regulator of spine development and synaptic structure."

Cortex Development

Recent NIH research has looked at the postnatal development of the cortex in children (Cortex Matures Faster in Youth with Highest IQ)

"The researchers found that the relationship between cortex thickness and IQ varied with age, particularly in the prefrontal cortex, seat of abstract reasoning, planning, and other "executive" functions. .... While the cortex was thinning in all groups by the teen years, the superior group showed the highest rates of change."

Postnatal cortex development trajectory.jpg

The developmental trajectory in cortex thickness differs as the brain matures in different IQ groups. Thickness of the area at the top/front/center, highlighted in MRI brain maps at left, peaks relatively late, at age 12 (blue arrow), in youth with superior intelligence, perhaps reflecting an extended critical period for development of high-level cognitive circuits. (Image and text source: NIMH Child Psychiatry Branch)

Human Tract Development

Human brain white matter tracts.png

MRI diffusion tensor imaging (DTI) provides information on white matter microstructure, including fractional anisotropy (FA).[8]


Hippocampus - Dentate Gyrus

There are a number of different markers[9] that can be used to identify hippocampal developmental changes:

  • proliferative events - PCNA, Ki-67, PH3, MCM2
  • early phases of neurogenesis and gliogenesis - nestin, GFAP, Sox2, Pax6
  • gliogenesis - vimentin, BLBP, S100beta
  • neurogenesis - NeuroD, PSA-NCAM, DCX

Lateral Ventricle - Subventricular Zone

Neurological Assessment

There are many different neurological assessment tests that have been designed over the years using a number of motor and intelligence (comprehension) skill tests. Some of these assessment tests are applicable to specific early neurological development ages. PD Larsen and SS Stensaas from the Utah School of Medicine have also made a series of movies demonstrating normal postnatal neurological development assessment.

Neonatal

  • Test of Infant Motor Performance (TIMP) can be used in very early development (from 32 weeks post-conceptional age to 4 months post-term). Involves observation of 28 items and elicitation of 31 items measures behaviours of functional relevance.
  • Einstein Neonatal Neurobehavioral Assessment Scale
  • Neurobehavioral Assessment of the Preterm Infant
  • Bayley Scales of Infant Development (BSID) a postnatal (from 1 to 42 months) neurological assessment scale used in screening and diagnosis of development using 178 item mental scale and the 111 item motor scale, the original BSID was revised in 1993 to version 2 (BSID-II).
  • Peabody Developmental Motor Scale II (PDMS-2) tests a child’s motor competence relative to his or her peers. Involves a series of evaluations: reflexes (8 items), stationary/nonlocomotor (30 items), locomotion (89 items), object manipulation (24 items), grasping (26 items) and visual-motor integration (72 items).

Infant

  • Alberta Infant Motor Scale (AIMS) birth to 18 months. Identify infants with motor delay (discrimination) and evaluates motor development over time.
  • Battelle Developmental Inventory Screening Test (BDIST) for children 6 months to 8 years old.
  • Brief Assessment of Motor Function (BAMF) is a series of 10-point ordinal scales developed for rapid description of gross motor, fine motor, and oral motor performance.
  • Fagan Test of Infant Intelligence (FTII)
  • Comprehensive Developmental Inventory for Infants and Toddlers (CDIIT) a developmental test designed in Taiwan.
  • Denver-II (CDIIT) a historic test redesigned as a version 2, for 3 and 72 months of age. It has been suggested that the test may require additional revision for better accuracy.
  • Bruininks-Oseretsky Test of Motor Proficiency (1978) ages 4.5 to 14.5 years.
  • Early Language Milestone Scale-2, Early Intervention Developmental Profile (EIDP), Gross Motor Function Measure (GMFM)

There are also a range of task based tests: Means-End Problem-Solving Task, Operant Discrimination Learning, Mobile/Train Conjugate Reinforcement Tasks, The Transparent Barrier Detour Task, The A-not-B Task

Postnatal Neural Examination

The links below are to a set of postnatal Neural Exam Movies by Paul D. Larsen, M.D., University of Nebraska Medical Center.

Additional postnatal movies are available on the Neural Exam Movies page.

Newborn Normal

Newborn-normal-behaviour.jpg Newborn n 03.jpg Newborn n 17.jpg Newborn n 20.jpg Newborn n 27.jpg
behaviour tone positions reflexes head

Newborn Abnormal

Newborn ab 01.jpg Newborn ab 03.jpg Newborn ab 17.jpg Newborn ab 20.jpg Newborn ab 27.jpg
behaviour tone positions reflexes head

Autism

Autism (autism spectrum disorder, ASD) is a behaviourally defined brain disorder in children. Features include: impoverished verbal and non-verbal communication skills, reduced social interactions (bias their attention towards objects rather than the surrounding social situation), behavioural impairments in attention engagement/disengagement, poor emotional discrimination and facial recognition, and fail to response to their own names. There exist many different and unproven claims as to the origins of autism.

Developmentally associated with neural maturation changes in cortical thickness and organization, and particularly affecting pyramidal neurons. A rat model shows structural and behavioural features of autism as a result of altering the trajectory of early postnatal cortical development.[10]


Additional Images

Magnetic Resonance Imaging of Neural Growth

Human brain and ventricular development imaged by MRI[11]

There are a growing number of magnetic resonance imaging (MRI) studies of brain development.

3 months to 30 years - Changes in cerebral grey and white matter volume from infancy to adulthood[12]

  • images of 158 normal subjects from infancy to young adulthood were studied (age range 3 months-30 years, 71 males, 87 females).
  • volume measures of whole brain, grey matter (GM) and white matter (GM) and gender-specific development
  • The resulting growth curve parameter estimates lead to the following observations: total brain volume is demonstrated to undergo an initial rapid spurt. The total GM volume peaks during childhood and decreases thereafter, whereas total WM volume increases up to young adulthood.
  • Relative to brain size, GM decreases and WM increases markedly over this age range in a non-linear manner, resulting in an increasing WM-to-GM ratio over much of the observed age range.
  • Significant gender differences brain volume and total white and grey matter volume are larger in males than in females, with a time-dependent difference over the age range studied. Over part of the observed age range females tend to have more GM volume relative to brain size and lower WM-to-GM ratio than males.

8 to 30 years - Subcortical brain development[13]

  • Brain development during late childhood and adolescence is characterized by decreases in gray matter (GM) and increases in white matter (WM) and ventricular volume.
  • developmental trajectories of 16 neuroanatomical volumes in the same sample of children, adolescents, and young adults (n = 171; range, 8-30 years).
  • The results revealed substantial heterogeneity in developmental trajectories. GM decreased nonlinearly in the cerebral cortex and linearly in the caudate, putamen, pallidum, accumbens, and cerebellar GM, whereas the amygdala and hippocampus showed slight, nonlinear increases in GM volume. WM increased nonlinearly in both the cerebrum and cerebellum, with an earlier maturation in cerebellar WM.
  • Differences between structures within the same regions: among the basal ganglia, the caudate showed a weaker relationship with age than the putamen and pallidum, and in the cerebellum, differences were found between GM and WM development.

Birth to 2 years - Human brain development[14]

  • Ninety-eight children received structural MRI scans: 84 children at 2-4 weeks, 35 at 1 year and 26 at 2 years of age.
  • total brain volume increased 101% in the first year, with a 15% increase in the second.
  • majority of hemispheric growth was accounted for by gray matter, which increased 149% in the first year
  • hemispheric white matter volume increased by only 11%.
  • Cerebellum volume increased 240% in the first year.
  • Lateral ventricle volume increased 280% in the first year, with a small decrease in the second.
  • caudate increased 19% and the hippocampus 13% from age 1 to age 2.
  • Cerebellum volume also increased substantially in the first year of life.



Links: Magnetic Resonance Imaging

References

  1. Shimony JS, Smyser CD, Wideman G, Alexopoulos D, Hill J, Harwell J, Dierker D, Van Essen DC, Inder TE & Neil JJ. (2016). Comparison of cortical folding measures for evaluation of developing human brain. Neuroimage , 125, 780-790. PMID: 26550941 DOI.
  2. Matsumoto M, Sawada M, García-González D, Herranz-Pérez V, Ogino T, Bang Nguyen H, Quynh Thai T, Narita K, Kumamoto N, Ugawa S, Saito Y, Takeda S, Kaneko N, Khodosevich K, Monyer H, Manuel García-Verdugo J, Ohno N & Sawamoto K. (2019). Dynamic changes in ultrastructure of the primary cilium in migrating neuroblasts in the postnatal brain. J. Neurosci. , , . PMID: 31685650 DOI.
  3. Perez EC, Bravo DR, Rodgers SP, Khan AR & Leasure JL. (2019). Shaping the adult brain with exercise during development: Emerging evidence and knowledge gaps. Int. J. Dev. Neurosci. , , . PMID: 31229526 DOI.
  4. Conrad MS, Sutton BP, Dilger RN & Johnson RW. (2014). An in vivo three-dimensional magnetic resonance imaging-based averaged brain collection of the neonatal piglet (Sus scrofa). PLoS ONE , 9, e107650. PMID: 25254955 DOI.
  5. Whiteus C, Freitas C & Grutzendler J. (2014). Perturbed neural activity disrupts cerebral angiogenesis during a postnatal critical period. Nature , 505, 407-11. PMID: 24305053 DOI.
  6. Hou J, Eriksen N & Pakkenberg B. (2011). The temporal pattern of postnatal neurogenesis found in the neocortex of the Göttingen minipig brain. Neuroscience , 195, 176-9. PMID: 21878372 DOI.
  7. Tran TS, Rubio ME, Clem RL, Johnson D, Case L, Tessier-Lavigne M, Huganir RL, Ginty DD & Kolodkin AL. (2009). Secreted semaphorins control spine distribution and morphogenesis in the postnatal CNS. Nature , 462, 1065-9. PMID: 20010807 DOI.
  8. Imperati D, Colcombe S, Kelly C, Di Martino A, Zhou J, et al. (2011) Differential Development of Human Brain White Matter Tracts. PLoS ONE 6(8): e23437. doi:10.1371/journal.pone.0023437 PloS One
  9. PMID 21647561
  10. Chomiak T, Karnik V, Block E, Hu B. Altering the trajectory of early postnatal cortical development can lead to structural and behavioural features of autism. BMC Neurosci. 2010 Aug 19;11:102. PMID: 20723245| BMC Neurosci.
  11. <pubmed>20108226</pubmed>
  12. <pubmed>20600789</pubmed>
  13. <pubmed>19776264</pubmed>
  14. <pubmed>19020011</pubmed>

Reviews

Deng W, Aimone JB & Gage FH. (2010). New neurons and new memories: how does adult hippocampal neurogenesis affect learning and memory?. Nat. Rev. Neurosci. , 11, 339-50. PMID: 20354534 DOI.

Pathania M, Yan LD & Bordey A. (2010). A symphony of signals conducts early and late stages of adult neurogenesis. Neuropharmacology , 58, 865-76. PMID: 20097213 DOI.

Ploeger A, Raijmakers ME, van der Maas HL & Galis F. (2010). The association between autism and errors in early embryogenesis: what is the causal mechanism?. Biol. Psychiatry , 67, 602-7. PMID: 19932467 DOI.

Geschwind DH. (2009). Advances in autism. Annu. Rev. Med. , 60, 367-80. PMID: 19630577 DOI.

Muhle R, Trentacoste SV & Rapin I. (2004). The genetics of autism. Pediatrics , 113, e472-86. PMID: 15121991

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Cite this page: Hill, M.A. (2019, December 15) Embryology Neural System - Postnatal. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Neural_System_-_Postnatal

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