Neural - Meninges Development
|Embryology - 3 Jun 2020 Expand to Translate|
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|A personal message from Dr Mark Hill (May 2020)|
|contributors to the site. The good news is Embryology will remain online and I will continue my association with UNSW Australia. I look forward to updating and including the many exciting new discoveries in Embryology!|
- 1 Introduction
- 2 Some Recent Findings
- 3 Pia Mater
- 4 Arachnoid Mater
- 5 Dura Mater
- 6 References
- 7 External Links
- 8 Additional Images
- 9 Terms
- 10 Glossary Links
The meninges (singular meninx; Greek, meninx = membrane) are a complex connective tissue surrounding the central nervous system (brain and spinal cord). The 3 layers from the central nervous outward are: pia mater, arachnoid mater, and the dura mater. All three layers form initially from the meninx primitiva, a meningeal mesenchyme. The pia mater and the arachnoid can together be called called leptomeninx, and dura mater the pachymeninx.
There have been many theories to the embryonic origins of the three layers that form the meninges, as well as potential differences between species. The safest term would be mesenchymal in origin, but the actual source of this mesenchyme may also differ in the same species at different levels of the central nervous system. The space under the arachnoid layer (subarachnoid space) is filled with cerebrospinal fluid.
Recent studies also suggest that rather than acting as a passive connective tissue "neural container" during development, the meninges may also interact and regulate cranial skull and neural development. A second recent change in understanding, is the identification of lymphatic vessels within the dura mater that develop in the postnatal period.
In studying meninges development vascular, lymphatic and cerebrospinal fluid development should also be considered.
Historically, see the 1951 paper describing spinal cord meninges development.
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 pia mater forms innermost part of the meningial layers and is a fine connective tissue covering of the central nervous system. Lies beneath the arachnoid materand then tough outer dura mater layer. All three layers form from the meninx primitiva, a meningeal mesenchyme that is mesodermal and neural crest in origin. The space overlying the pia mater (subarachnoid space) is filled with cerebrospinal fluid. The pia mater has close contact with the spinal cord and brain, in the brain it follows down into the sulci and fissures of the cortex. This layer also fuses with the membranous lining of the ventricles (Template:Ependyma) forming the choroid plexus.
The arachnoid mater (Greek, arachne = spider + -oeides = form) forms the central part of the meninges layers as a meshwork (spider web-like) connective tissue covering of the central nervous system. Lying between the tough outer dura mater layer and the inner fine pia mater layer. All three layers form from the meninx primitiva, a meningeal mesenchyme that is mesodermal and neural crest in origin. The space underlying the arachnoid mater (subarachnoid space) is filled with cerebrospinal fluid.
The dura mater (Latin, dura mater = hard mother) forms the outer tough connective tissue layer of the meninges 3 layers that cover the central nervous system. of 3 layers (overlays the arachnoid mater middle layer and pia mater inner layer). All three layers form from the meninx primitiva, a meningeal mesenchyme that is mesodermal and neural crest in origin.
At the level of the skull, the outer dura layer forms the inner periosteum of the skull and the inner dura layer forms the dural folds (falx and tentorium) that contains the dural sinuses. The dura mater also expresses osteogenic growth factors that may be required for ossification of cranial vault bones. At the level of the spinal cord, the dura is separated from the periosteum of the vertebral canal by an epidural space.
Dural Lymphatic Vessels
Lymphatic vessels are uniquely found within the dura mater, and these vessels only develop during the postnatal period. They are thought to have a role in trafficking neural macromolecules to the deep cervical lymph nodes.
Dural Venous Sinuses
The dural venous sinuses form the major drainage of the brain to the internal jugular veins in the adult.
The dural venous sinuses:
- lie between the dura mater layers (endosteal layer and meningeal)
- run alone not parallel to arteries.
- are valveless allowing for bidirectional blood flow
Unpaired - superior sagittal sinus, inferior sagittal sinus, straight sinus, occipital sinus, intercavernous sinus Paired - transverse sinus, sigmoid sinus, superior petrosal sinus, inferior petrosal sinus, cavernous sinus, sphenoparietal sinus, basilar venous plexus
The following figures are from a 1915 study of the venous sinuses of the dura mater in the human embryo.
fig 1 embryo 4 mm Embryo No. 588
fig 2 embryo 13.8 mm Embryo No. 940
fig 3 embryo 18 mm Embryo No. 144
fig 4 embryo 21 mm No. 460
fig 5 embryo 24 mm No. 632
fig 6 embryo 50 mm No. 96
fig 7 embryo 13.8 mm No. 940
fig 8 embryo 20 mm No. 349
fig 9 fetus 54 mm No. 458
fig 11 embryo 14 mm No. 940
fig 12 embryo 18 mm No. 144
fig 13 embryo 21 mm No. 460
fig 14 embryo 35 mm No. 100
fig 15 fetus 50 mm No. 96
fig 16 fetus 80 mm No. 234a
- Jani RH & Sekula RF. (2018). Magnetic Resonance Imaging of Human Dural Meningeal Lymphatics. Neurosurgery , 83, E10-E12. PMID: 29917137 DOI.
- Bálint L, Ocskay Z, Deák BA, Aradi P & Jakus Z. (2019). Lymph Flow Induces the Postnatal Formation of Mature and Functional Meningeal Lymphatic Vessels. Front Immunol , 10, 3043. PMID: 31993056 DOI.
- Sensenig EC. The early development of the meninges of the spinal cord in human embryos. (1951) Contrib. Embryol., Carnegie Inst. Wash. Publ. 611,
- Rai R, Iwanaga J, Shokouhi G, Oskouian RJ & Tubbs RS. (2018). The Tentorium Cerebelli: A Comprehensive Review Including Its Anatomy, Embryology, and Surgical Techniques. Cureus , 10, e3079. PMID: 30305987 DOI.
- Saunders NR, Dziegielewska KM, Møllgård K & Habgood MD. (2018). Physiology and molecular biology of barrier mechanisms in the fetal and neonatal brain. J. Physiol. (Lond.) , , . PMID: 29774535 DOI.
- Izen RM, Yamazaki T, Nishinaka-Arai Y, Hong YK & Mukouyama YS. (2018). Postnatal development of lymphatic vasculature in the brain meninges. Dev. Dyn. , , . PMID: 29493038 DOI.
- Yay A, Ozdamar S, Canoz O, Baran M, Tucer B & Sonmez MF. (2014). Intermediate filament protein nestin is expressed in developing meninges. Bratisl Lek Listy , 115, 718-22. PMID: 25428542
- Streeter GL. The development of the venous sinuses of the dura mater in the human embryo. (1915) Amer. J Anat.18: 145-178.
Weller RO, Sharp MM, Christodoulides M, Carare RO & Møllgård K. (2018). The meninges as barriers and facilitators for the movement of fluid, cells and pathogens related to the rodent and human CNS. Acta Neuropathol. , 135, 363-385. PMID: 29368214 DOI.
Mortazavi MM, Quadri SA, Khan MA, Gustin A, Suriya SS, Hassanzadeh T, Fahimdanesh KM, Adl FH, Fard SA, Taqi MA, Armstrong I, Martin BA & Tubbs RS. (2018). Subarachnoid Trabeculae: A Comprehensive Review of Their Embryology, Histology, Morphology, and Surgical Significance. World Neurosurg , 111, 279-290. PMID: 29269062 DOI.
Adeeb N, Mortazavi MM, Deep A, Griessenauer CJ, Watanabe K, Shoja MM, Loukas M & Tubbs RS. (2013). The pia mater: a comprehensive review of literature. Childs Nerv Syst , 29, 1803-10. PMID: 23381008 DOI.
Patel N & Kirmi O. (2009). Anatomy and imaging of the normal meninges. Semin. Ultrasound CT MR , 30, 559-64. PMID: 20099639
O'Rahilly R & Müller F. (1986). The meninges in human development. J. Neuropathol. Exp. Neurol. , 45, 588-608. PMID: 3746345
Yokogawa N, Murakami H, Demura S, Kato S, Yoshioka K, Yamamoto M, Iseki S & Tsuchiya H. (2015). Effects of Radiation on Spinal Dura Mater and Surrounding Tissue in Mice. PLoS ONE , 10, e0133806. PMID: 26214850 DOI.
Baltsavias G, Parthasarathi V, Aydin E, Al Schameri RA, Roth P & Valavanis A. (2015). Cranial dural arteriovenous shunts. Part 1. Anatomy and embryology of the bridging and emissary veins. Neurosurg Rev , 38, 253-63; discussion 263-4. PMID: 25468011 DOI.
Tochitani S & Kondo S. (2013). Immunoreactivity for GABA, GAD65, GAD67 and Bestrophin-1 in the meninges and the choroid plexus: implications for non-neuronal sources for GABA in the developing mouse brain. PLoS ONE , 8, e56901. PMID: 23437266 DOI.
Search Pubmed: Development Meninges Development
Salvi G. Meninges histogenesis and structure (L'istogenesi E La Struttura Delle Meningi). (1898) Thèse de Paris.
Heuser CH. The development of the cerebral ventricles in the pig. (1913) Amer. J Anat. 15(2): 215-251.
Harvey SC. and Burr HS. An experimental study of the origin of the meninges. (1924) Proc. Soc. Exper. Biol. and Med. 22: 52-53.
Harvey SC. and Burr HS. The development of the meninges. (1926) Arch Neurol Psychiatry 15:545–567
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|Embryology History | Historic Embryology Papers)|
Sensenig EC. The early development of the meninges of the spinal cord in human embryos. (1951) Contrib. Embryol., Carnegie Inst. Wash. Publ. 611,
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Cite this page: Hill, M.A. (2020, June 3) Embryology Neural - Meninges Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Neural_-_Meninges_Development
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