Arachnoid trabeculae: Difference between revisions
m Added abbreviations for arachnoid and subarachnoid trabeculae. |
Note that AT embryology is similar in humans and mice. |
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There are five principal architectures of arachnoid trabeculae structures, whose shapes may be described as single strands, branched strands, tree-like shapes, sheets, and trabecular networks.<ref name="Saboori2021">{{cite journal |last1=Saboori |first1=Parisa |title=Subarachnoid space trabeculae architecture |journal=Clinical anatomy |date=2021 |volume=34 |issue=1 |pages=40–50 |doi=10.1002/ca.23635 |pmid=32519396}}</ref> |
There are five principal architectures of arachnoid trabeculae structures, whose shapes may be described as single strands, branched strands, tree-like shapes, sheets, and trabecular networks.<ref name="Saboori2021">{{cite journal |last1=Saboori |first1=Parisa |title=Subarachnoid space trabeculae architecture |journal=Clinical anatomy |date=2021 |volume=34 |issue=1 |pages=40–50 |doi=10.1002/ca.23635 |pmid=32519396}}</ref> |
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The arachnoid trabeculae structure of humans and rats have been shown to have similar morphology. Therefore many studies of AT use rats instead of humans.{{sfn|Saboori|Sadegh|2015|page=3}} |
The arachnoid trabeculae structure of humans and rats have been shown to have similar morphology. Therefore many studies of AT use rats instead of humans.{{sfn|Saboori|Sadegh|2015|page=3}} |
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==Development== |
==Development== |
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Revision as of 08:12, 1 November 2024
| Arachnoid trabeculae | |
|---|---|
 The arachnoid trabeculae connecting the arachnoid and pial layers of the meninges | |
| Identifiers | |
| TA98 | A14.1.01.206 |
| TA2 | 5390 |
| FMA | 77761 |
| Anatomical terminology | |
The arachnoid trabeculae (AT) are delicate strands of connective tissue that loosely connect the two innermost layers of the meninges – the arachnoid mater and the pia mater.[1][2] They are found within the subarachnoid space where cerebrospinal fluid is also found. Arachnoid trabeculae are also known as subarachnoid trabeculae (SAT) or leptomeningeal trabeculae.[3]
Structure
Human cranial arachnoid trabeculae are made mostly of type I collagen.[4] They help to limit displacement of the brain relative to the skull. The region-dependence of trabeculae volume fraction has a strong influence on the magnitude and distribution of brain deformation in the event of head impact. A study of 7 post-mortem human brains found that average trabecula fiber width was 30µm, and the average volume fraction was 26%.[5]
There are five principal architectures of arachnoid trabeculae structures, whose shapes may be described as single strands, branched strands, tree-like shapes, sheets, and trabecular networks.[6]
The arachnoid trabeculae structure of humans and rats have been shown to have similar morphology. Therefore many studies of AT use rats instead of humans.[7] Also AT embryology is similar in humans and mice.[8]
Development
Embryologically, the arachnoid trabeculae are the remnants of the common precursor that forms both the arachnoid and pial layers of the meninges.[9] The initial development of the subarachnoid space occurs in two phases:[3]
- A mesenchymal layer "invades" between the embryonic epithelium and the developing neuroepithelium of the telencephalon. The extracellular space is filled with GAG (glycosaminoglycan) gel.
- The trabecular structure arises from withdrawal of the GAG gel. This results in fluid-filled cavities with random spacing and size. The mesenchymal material between these cavities is the origin of the arachnoid trabeculae. The upper and lower surfaces of the layer become the arachnoid and pia mater membranes, to which the trabecular structure remains attached.
See also
- Subarachnoid cisterns
- Subarachnoid hemorrhage
- Trabecula
- Arachnoid granulation, also known as arachnoid villi
- Dura mater
Notes
- ^ "Arachnoid trabeculae." Encyclopædia Britannica. 2010. Encyclopædia Britannica Online. 09 Sep. 2010.
- ^ Diamond, Marian Cleaves; Scheibel, Arnold Bernard; Elson, Lawrence M. (1985). The Human Brain Coloring Book. New York: Barnes & Noble. p. 9–10. ISBN 978-0-06-460306-5.
- ^ a b Mortazavi, Martin M.; Quadri, Syed A.; Khan, Muhammad A.; Gustin, Aaron; Suriya, Sajid S.; Hassanzadeh, Tania; Fahimdanesh, Kian M.; Adl, Farzad H.; Fard, Salman A.; Taqi, M. Asif; Armstrong, Ian; Martin, Bryn A.; Tubbs, R. Shane (2018). "Subarachnoid Trabeculae: A Comprehensive Review of Their Embryology, Histology, Morphology, and Surgical Significance". World Neurosurgery. 111: 279–290. doi:10.1016/j.wneu.2017.12.041.
- ^ Saboori, Parisa; Sadegh, Ali (2015). "Histology and Morphology of the Brain Subarachnoid Trabeculae". Anatomy research international. 2015: 1–10. doi:10.1155/2015/279814. PMID 26090230.
- ^ Benko, Nikolaus; Luke, Emma; Alsanea, Yousef; Coats, Brittany (2020). "Spatial distribution of human arachnoid trabeculae". Journal of Anatomy. 237 (2): 275–284. doi:10.1111/joa.13186.
- ^ Saboori, Parisa (2021). "Subarachnoid space trabeculae architecture". Clinical anatomy. 34 (1): 40–50. doi:10.1002/ca.23635. PMID 32519396.
- ^ Saboori & Sadegh 2015, p. 3.
- ^ Mortazavi et al. 2018, p. 280.
- ^ Farr, Gary, MD. "The Nervous System - Advanced Version / The Meninges" Archived December 30, 2010, at the Wayback Machine, 24 Jun 2002. Retrieved 9 Sep 2010.
