Arachnoid mater
American Heritage Stedman's Medical Dictionary:
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arachnoid membrane
n.
A delicate fibrous membrane forming the middle of the three coverings of the brain and spinal cord, closely attached to the dura mater, from which it is separated only by the subdural cleft, but separated from the pia mater by the subarachnoid space.
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Arachnoid mater
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Arachnoid mater
| Brain: Arachnoid mater | ||
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| Coronal view of the brain showing the Arachnoid mater and neighboring anatomical structures. | ||
| Gray's | subject #193 876 | |
| Part of | Meninges | |
| NeuroNames | ancil-561 | |
| MeSH | Arachnoid | |
The arachnoid mater is one of the three meninges, the protective membranes that cover the brain and spinal cord. It is named after the Greek words "Arachne" and suffix "-oid" -"in the image of", and "mater" the Latin word for mother, because of the fine spider web-like appearance of the delicate fibres of the arachnoid which extend down through the subarachnoid space and attach to the pia mater.
It is interposed between the two other meninges, the more superficial dura mater and the deeper pia mater, from which it is separated by the subarachnoid space. The delicate arachnoid layer is attached to the inside of the dura and surrounds the brain and spinal cord. It does not line the brain down into its sulci (folds), as does the pia mater, with the exception of the longitudinal fissure, which divides the left and right cerebral hemispheres. Cerebrospinal fluid flows under this membrane in the subarachnoid space.
The pia mater covering the brain is referred to as the "arachnoidea encephal", and the portion covering the spinal cord as the "arachnoidea spinalis". The arachnoid and pia mater are sometimes considered as a single structure, the leptomeninx, or the plural version, leptomeninges. ("Lepto"- from the Greek root meaning "thin"). Similarly, the dura in this situation is called the pachymeninx. The arachnoid mater makes arachnoid villi which helps to defuse of CSF to venous dura sinuses.
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Additional images
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Meninges of the
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Diagrammatic section of scalp.
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The medulla spinalis and its membranes.
References
- Orlando Regional Healthcare, Education and Development. 2004. "Overview of Adult Traumatic Brain Injuries." Retrieved on 2008-01-16.
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American Heritage Stedman's Medical Dictionary
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company.
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