Difference between revisions of "File:Stage 22 image 217.jpg"

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| Human embryo, [[Week 8]], [[Carnegie stage 22]] section from the neural tube at the level of the developing cortex. Inset (upper right) shows section overview and approximate level of section (red line). Developing cerebrum layer thicknesses are shown in microns.
 
| Human embryo, [[Week 8]], [[Carnegie stage 22]] section from the neural tube at the level of the developing cortex. Inset (upper right) shows section overview and approximate level of section (red line). Developing cerebrum layer thicknesses are shown in microns.
  
 
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===Cortex===
 
The thin outer layer called cortical plate will eventually form the adult brain '''cortex'''. The other underlying layers are part of the development process and will continue to supply cells to the cortex through fetal period, these layers will eventually be almost completely lost. Layers are named according to the nervous system revised terminology (1970)<ref name=PMID5414696><pubmed>5414696</pubmed></ref>
 
The thin outer layer called cortical plate will eventually form the adult brain '''cortex'''. The other underlying layers are part of the development process and will continue to supply cells to the cortex through fetal period, these layers will eventually be almost completely lost. Layers are named according to the nervous system revised terminology (1970)<ref name=PMID5414696><pubmed>5414696</pubmed></ref>
  
The [[Neural_-_Ventricular_System_Development|ventricle]] is the CSF fluid-filled space within the brain. The inset image shows lying within the ventricles, part of the '''choroid plexus''' that forms and secretes the CSF.
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===Ventricular Space===
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Developing [[Neural_-_Ventricular_System_Development|lateral ventricle]] is the cerebrospinal fluid (CSF) filled space within the cortical region of the brain. The inset image shows lying within the lateral ventricles, the '''choroid plexus''' the modified vascular structure that forms and secretes the CSF.
  
Outside the developing cortex the developing [[Neural - Meninges Development|brain meninges]] pia and sub-arachnoid layers can also be seen.
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===Meninges===
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Developing [[Neural - Meninges Development|meninges]] pia and sub-arachnoid layers can also be seen.
  
 
| [[File:Stage22 HPA2L.jpg|300px]]
 
| [[File:Stage22 HPA2L.jpg|300px]]

Revision as of 09:01, 27 May 2017

Human Embryo Developing Cortex

Human embryo, Week 8, Carnegie stage 22 section from the neural tube at the level of the developing cortex. Inset (upper right) shows section overview and approximate level of section (red line). Developing cerebrum layer thicknesses are shown in microns.

Cortex

The thin outer layer called cortical plate will eventually form the adult brain cortex. The other underlying layers are part of the development process and will continue to supply cells to the cortex through fetal period, these layers will eventually be almost completely lost. Layers are named according to the nervous system revised terminology (1970)[1]

Ventricular Space

Developing lateral ventricle is the cerebrospinal fluid (CSF) filled space within the cortical region of the brain. The inset image shows lying within the lateral ventricles, the choroid plexus the modified vascular structure that forms and secretes the CSF.

Meninges

Developing meninges pia and sub-arachnoid layers can also be seen.

Stage22 HPA2L.jpg

Low resolution image

Neural Tube Development
Neural Tube Primary Vesicles Secondary Vesicles Adult Structures
week 3 week 4 week 5 adult
neural plate
neural groove
neural tube

Brain
prosencephalon (forebrain) telencephalon Rhinencephalon, Amygdala, hippocampus, cerebrum (cortex), hypothalamus‎, pituitary | Basal Ganglia, lateral ventricles
diencephalon epithalamus, thalamus, Subthalamus, pineal, posterior commissure, pretectum, third ventricle
mesencephalon (midbrain) mesencephalon tectum, Cerebral peduncle, cerebral aqueduct, pons
rhombencephalon (hindbrain) metencephalon cerebellum
myelencephalon medulla oblongata, isthmus
spinal cord, pyramidal decussation, central canal
Links: Image - cortex overview | Image - cortex layers | Image - high resolution version | Cerebrum Development | Meninges Development


Note this section image is vertically flipped compared with original serial section images.

Selected Embryo Histology - Week 8 (Stage 22)  
Links: Carnegie stage 22 | Week 8


Stage 22 Links: Week 8 | System Development | Lecture - Limb | Lecture - Head Development | Lecture - Sensory | Science Practical - Head | Science Practical - Sensory | Science Practical - Urogenital | Historic - Skull Development | Carnegie Embryos | Madrid Embryos | Category:Carnegie Stage 22 | Next Stage 23
Week 8, GA week 10, 54 - 56 days, CRL 23 - 28 mm, Carnegie Embryos
  Historic Papers: 1914 | 1954 Stage 19-23
Carnegie Stages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | About Stages | Timeline
Week: 1 2 3 4 5 6 7 8
Carnegie stage: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
  1. <pubmed>5414696</pubmed>

Cite this page: Hill, M.A. (2021, June 22) Embryology Stage 22 image 217.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Stage_22_image_217.jpg

What Links Here?
© Dr Mark Hill 2021, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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current01:09, 23 August 2011Thumbnail for version as of 01:09, 23 August 20111,200 × 820 (323 KB)S8600021 (talk | contribs)==Human Embryo Developing Cortex== * Week 8, Carnegie stage 22 * Note this section image is vertically flipped compared with serial original serial images. :Links: Neural System Development Cortex-with-section-insert-4.jpg (scan 35815 cropped and sc