Difference between revisions of "Neural - Ventricular System Development"
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Latest revision as of 12:10, 15 December 2019
|Embryology - 18 Jan 2020 Expand to Translate|
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- 1 Introduction
- 2 Some Recent Findings
- 3 Development Overview
- 4 Choroid Plexus
- 5 CSF Synthesis
- 6 CSF Reabsorption
- 7 Adult CSF Normal Values
- 8 CSF Circulation
- 9 Abnormalities
- 10 References
- 11 External Links
- 12 Additional Images
- 13 Terms
- 14 Glossary Links
The ventricular system develops from the single cavity formed from the hollow neural tube. This fluid-filled space is separated from the amnion following fusion of the neural tube and closure of neuropores. At different regions sites within the wall (floor of lateral ventricle and roof of the third and fourth ventricles) differentiate to form choroid plexus a modified vascular structure which will produce cerebrospinal fluid (CSF)
In development and the space within the spinal cord (central canal) and the brain (ventricles) was derived from the same space within the neural tube. In the adult these 2 spaces remain connected containing the same CSF.
Early in development the cavity within the neural tube (which will form the ventricular space) is filled with amniotic fluid. As the brain and spinal cord grow, this fluid filled space makes up the majority of the nervous system (by volume). Upon closure of the neuropores and development of the embryonic vasculature, this fluid is then synthesized by the choroid plexus, a specialized vascular epithelium. In mammals, the choroid plexuses develop at four sites in the roof of the neural tube shortly after its closure, in the order fourth (IV), lateral, and third (III) ventricles.
The choroid plexuses form one region of the blood-brain barrier that regulates the brain's internal environment.
In the adult, the choroid plexus produces about two thirds of the CSF, the rest is produced by ventricular ependymal cells and cells lining the subarachnoid space. Normal CSF contains high amounts of salts, sugars and lipids and low amounts of protein (0.3-0.7 microg/microL), though there appears to be 60+ proteins as identified by 2D gel. Presence of some protein in the CSF can be indicative of disruption of or incomplete blood/brain barrier.
|Historic Papers - Ventricular|
Heuser CH. The development of the cerebral ventricles in the pig. (1913) Amer. J Anat. 15(2): 215-.
Weed LH. The development of the cerebro-spinal spaces in pig and in man. (1917) Contrib. Embryol., Carnegie Inst. Wash., 5, No. 14 .
Sensenig EC. The early development of the meninges of the spinal cord in human embryos. (1951) Contrib. Embryol., Carnegie Inst. Wash. Publ. 611,
Some Recent Findings
|More recent papers|
This table allows an automated computer search of the external PubMed database using the listed "Search term" text link.
|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.
The initial neural grove and tube, with open neuropores, is filled with amniotic fluid. By stage 13 (4 weeks, GA week 6) the neuropores are closed and the neural tube is no longer directly connected to the amniotic cavity. Initially during early 3 and 5 vesicle neural stages and prior to choroid plexus development, the "ventricular space" is reliant upon overall tube growth and directional fluid transport to maintain the fluid-filled space. There is research suggesting that hydrostatic pressure and a functioning heart are required to maintain the vesicle spaces, and there are several models as to how pressure and osmotic gradients may be established. See also zebrafish model studies and a recent review.
|Week 4||11||appearance of the optic ventricle. The neural groove/tube space is initially filled with amniotic fluid.|
|12||closure of the caudal neuropore, onset of the ventricular system and separates the ependymal from the amniotic fluid.|
|13||cavity of the telencephalon medium is visible.|
|Week 5||14||cerebral hemispheres and lateral ventricles begin, rhomboid fossa becomes apparent.|
|15||medial and lateral ventricular eminences cause indentations in the lateral ventricle|
|Week 6||16||hypothalamic sulcus is evident.|
|17 - 18||interventricular foramina are becoming relatively smaller, and cellular accumulations indicate the future choroid villi of the fourth and lateral ventricles.|
|Week 7||18||areae membranaceae rostralis and caudalis are visible in the roof of the fourth ventricle, and the paraphysis is appearing.|
|19||choroid villi are visible in the fourth ventricle, and a mesencephalic evagination (blindsack) is visible|
|Week 8||20||choroid villi are visible in the lateral ventricle.|
|21||olfactory ventricle is visible.|
|21 - 23||lateral ventricle has become C-shaped (anterior and inferior horns visible). Recesses develop in the third ventricle (optic, infundibular, pineal).|
|Links: ventricular | neural | timeline | Category:Timeline Table Data Reference|
Fetal Period - posterior horn of the lateral ventricle, choroid plexus of the third ventricle, suprapineal recess, interthalamic adhesion, aqueduct, and apertures in the roof of the fourth ventricle.
The choroid plexus along with ventricular ependymal cells and cells lining the subarachnoid space synthesise CSF. In humans, the choroid plexuses develop at four sites in the roof of the neural tube shortly after its closure, in the order fourth (IV), lateral, and third (III) ventricles.
|Human Ventricular System
A schematic diagram of structures and specialized cell types bordering the different parts of the mammalian ventricular system, and in contact with the cerebrospinal fluid (CSF)
Epithelium from the neural tube epithelium.
Mesenchyma from the meninges.
Enzymes required for CSF production are Na+/K+ ATPase and carbonic anhydrase.
Subarachnoid Space Development
- Stage 14 (33 days) - initially as irregular spaces on the ventral surface of the spinal cord.
- Stage 18 (44 days) - dura mater is formed and spaces surround the circumference of the spinal cord, which coalesce and contain many blood vessels.
Data from Patelska-Banaszewska M, Wozniak W. (2005)
Two key enzymes are required to produce CSF they are the Na+/K+ ATPase and carbonic anhydrase.
Other known chorid plexus enzymes include: alkaline and acid phosphatases, magnesium-dependent ATPase, glucose-6-phosphatase, thiamine pyrophosphatase, adenylate cyclase, oxidoreductase, esterases, hydrolases, cathepsin D, and glutathion S-transferase. (More? Catala M., 1998)
- "The epithelial cells of the choroid plexus secrete cerebrospinal fluid (CSF), by a process that involves the movement of Na(+), Cl(-) and HCO(3)(-) from the blood to the ventricles of the brain. This creates the osmotic gradient, which drives the secretion of H(2)O. The unidirectional movement of the ions is achieved due to the polarity of the epithelium, i.e., the ion transport proteins in the blood-facing (basolateral) are different to those in the ventricular (apical) membranes."
Arachnoid Granulation (image: Gray's Anatomy)
CSF drainage (absorption or reabsorption) into the venous system is through arachnoid granulations.
CSF in the subarachnoid space extends into the arachnoid granulations, which then project through the dura into the superior sagittal sinus.
See also note in CSF Circulation section, point 3.
Adult CSF Normal Values
- Opening pressure: 50–200 mm H2O CSF
- Color: Colorless
- Turbidity: Crystal clear
- Mononuclear cells: less than 5 / mm3
- Polymorphonuclear leukocytes: 0
- Total protein: 22–38 mg/dl Range 9–58 mg/dl (mean ± 2.0 SD)
- Glucose: 60–80% of blood glucose
(Data from: Clinical Methods, 3rd ed, Table 74.1)
Information below is for the adult and is based upon data from a radiologic investigation using MR imaging and radionuclide cisternography.
- CSF-circulation is propelled by a pulsating flow, which causes an effective mixing. Flow is produced by the alternating pressure gradient, which is a consequence of the systolic expansion of the intracranial arteries causing expulsion of CSF into the compliant and contractable spinal subarachnoid space.
- No bulk flow is necessary to explain the transport of tracers in the subarachnoid space.
- Main absorption of the CSF is not through the Pacchionian granulations (arachnoid granulations), but a major part of the CSF transportation to the blood-stream is likely to occur via the paravascular and extracellular spaces of the central nervous system. (MH- Note this statement conflicts with previous CSF Reabsorption in literature)
- The intracranial dynamics may be regarded as the result of an interplay between the demands for space by the four components of the intracranial content (arterial blood, brain volume, venous blood and CSF).
- Interaction has a time offset within the cerebral hemispheres in a fronto-occipital direction during the cardiac cycle (the fronto-occipital "volume wave").
- Outflow from the cranial cavity to the cervical subarachnoid space (SAS) is dependent in size and timing on the intracranial arterial expansion during systole.
Dandy Walker Syndrome
The vermis of the cerebellum can be small or absent, the fourth ventricle enlarges due to cyst formation.
An ultrasound study of fetuses with Dandy-Walker malformation 13 to 16 weeks (GA 15-18 weeks) identified the fourth ventricle widely open posteriorly, even in the standard transcerebellar view, and the brainstem-vermis (BV) angle was > 45°, significantly increased compared to that in normal fetuses (P < 0.0001). Note that at this age, an open fourth ventricle can also found in about 10% of normal fetuses.
- Boardman JP, Ireland G, Sullivan G, Pataky R, Fleiss B, Gressens P & Miron V. (2018). The Cerebrospinal Fluid Inflammatory Response to Preterm Birth. Front Physiol , 9, 1299. PMID: 30258368 DOI.
- Koshida R, Oishi H, Hamada M, Takei Y & Takahashi S. (2017). MafB is required for development of the hindbrain choroid plexus. Biochem. Biophys. Res. Commun. , 483, 288-293. PMID: 28025141 DOI.
- Khazanov S, Paz Y, Hefetz A, Gonzales BJ, Netser Y, Mansour AA & Ben-Arie N. (2017). Floor plate descendants in the ependyma of the adult mouse Central Nervous System. Int. J. Dev. Biol. , 61, 257-265. PMID: 27528042 DOI.
- Jain N, Lim LW, Tan WT, George B, Makeyev E & Thanabalu T. (2014). Conditional N-WASP knockout in mouse brain implicates actin cytoskeleton regulation in hydrocephalus pathology. Exp. Neurol. , 254, 29-40. PMID: 24462670 DOI.
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- Veening JG & Barendregt HP. (2010). The regulation of brain states by neuroactive substances distributed via the cerebrospinal fluid; a review. Cerebrospinal Fluid Res , 7, 1. PMID: 20157443 DOI.
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- aqueduct of Sylvius - (cerebral aqueduct) acts as a tubular communication between the third and fourth ventricles.
- cerebral aqueduct - (aqueduct of Sylvius) acts as a tubular communication between the third and fourth ventricles.
- cerebrospinal fluid -
- choroid plexus
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Cite this page: Hill, M.A. (2020, January 18) Embryology Neural - Ventricular System Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Neural_-_Ventricular_System_Development
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