Arachnoid mater: Difference between revisions
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==Overview== | ==Overview== | ||
The '''arachnoid mater''' is one of the three [[meninges]], the membranes that cover the [[brain]] and [[spinal cord]]. It is interposed between the two other meninges, the more superficial [[dura mater]] and the deeper [[pia mater]], and is separated from the pia mater by the [[subarachnoid space]]. | The '''arachnoid mater''' is one of the three [[meninges]], the membranes that cover the [[brain]] and [[spinal cord]]. It is interposed between the two other meninges, the more superficial [[dura mater]] and the deeper [[pia mater]], and is separated from the pia mater by the [[subarachnoid space]]. | ||
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The arachnoid and pia mater are sometimes considered as a single structure, the ''leptomeninx'', or the plural version, ''leptomeninges''. (Lepto- from the root meaning ''thin'' in Greek). Similarly, the dura in this situation is called the ''pachymeninx''. | The arachnoid and pia mater are sometimes considered as a single structure, the ''leptomeninx'', or the plural version, ''leptomeninges''. (Lepto- from the root meaning ''thin'' in Greek). Similarly, the dura in this situation is called the ''pachymeninx''. | ||
== | ==Historical Perspective== | ||
''Arachnoid'' is from a Greek root, and means ''cob web like''. The ''mater'' designation (meaning ''mother'' in Latin) is borrowed from the ''dura mater'' and ''pia mater'', which were Latin translations of Arabic terms. While ''mater'' does not technically belong with the arachnoid layer, it has nevertheless been adopted by it for uniformity with the other meninges, and ''arachnoid mater'' is currently the [[Terminologia Anatomica]] international standard. | ''Arachnoid'' is from a Greek root, and means ''cob web like''. The ''mater'' designation (meaning ''mother'' in Latin) is borrowed from the ''dura mater'' and ''pia mater'', which were Latin translations of Arabic terms. While ''mater'' does not technically belong with the arachnoid layer, it has nevertheless been adopted by it for uniformity with the other meninges, and ''arachnoid mater'' is currently the [[Terminologia Anatomica]] international standard. | ||
== | ==Images== | ||
<gallery> | <gallery> | ||
Image:Illu meninges.jpg|Meninges of the CNS | Image:Illu meninges.jpg|Meninges of the CNS | ||
Image:Gray1196.png|Diagrammatic section of scalp. | Image:Gray1196.png|Diagrammatic section of scalp. | ||
</gallery> | </gallery> | ||
==Related Chapters== | |||
* [[Arachnoid cyst]] | |||
==References== | ==References== | ||
* Orlando Regional Healthcare, Education and Development. 2004. [http://www.orlandoregional.org/pdf%20folder/overview%20adult%20brain%20injury.pdf "Overview of Adult Traumatic Brain Injuries."] Retrieved on 2008-01-16. | * Orlando Regional Healthcare, Education and Development. 2004. [http://www.orlandoregional.org/pdf%20folder/overview%20adult%20brain%20injury.pdf "Overview of Adult Traumatic Brain Injuries."] Retrieved on 2008-01-16. | ||
{{Meninges}} | {{Meninges}} | ||
Latest revision as of 20:50, 28 November 2012
Template:Infobox Brain Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
The arachnoid mater is one of the three meninges, the membranes that cover the brain and spinal cord. It is interposed between the two other meninges, the more superficial dura mater and the deeper pia mater, and is separated from the pia mater by the subarachnoid space.
The delicate, spiderweb-like (therefore the name) arachnoid layer, attached to the inside of the dura, surrounds the brain and spinal cord but does not line the brain down into its sulci (folds). Cerebrospinal fluid flows under this membrane in the subarachnoid space, which is full of the delicate fibres of the arachnoid extending down to attach to the pia mater.
The portions covering the brain and spinal cord are called arachnoidea encephali and arachnoidea spinalis, respectively.
The arachnoid and pia mater are sometimes considered as a single structure, the leptomeninx, or the plural version, leptomeninges. (Lepto- from the root meaning thin in Greek). Similarly, the dura in this situation is called the pachymeninx.
Historical Perspective
Arachnoid is from a Greek root, and means cob web like. The mater designation (meaning mother in Latin) is borrowed from the dura mater and pia mater, which were Latin translations of Arabic terms. While mater does not technically belong with the arachnoid layer, it has nevertheless been adopted by it for uniformity with the other meninges, and arachnoid mater is currently the Terminologia Anatomica international standard.
Images
-
Meninges of the CNS
-
Diagrammatic section of scalp.
Related Chapters
References
- Orlando Regional Healthcare, Education and Development. 2004. "Overview of Adult Traumatic Brain Injuries." Retrieved on 2008-01-16.
Template:Meninges Template:Spinal cord it:Aracnoide (anatomia) nl:Spinnenwebvlies no:Spindelvevshinne sv:Arachnoidea th:เยื่ออะแร็กนอยด์