Arachnoid mater From Wikipedia, the free encyclopedia Jump to navigation Jump to search Arachnoid mater Image showing arachnoid mater and the underlying subarachnoid space Image showing parts of the arachnoid mater, including arachnoid granulations. Details Part of Meninges Identifiers MeSH D001099 NeuroNames 1464 TA98 A14.1.01.201 TA2 5386 FMA 9591 Anatomical terms of neuroanatomy [ edit on Wikidata ] The arachnoid mater is one of the three meninges , the protective membranes that cover the brain and spinal cord . The arachnoid mater is a derivative of the neural crest mesectoderm in the embryo. Contents 1 Structure 2 Function 3 Etymology 4 Additional images 5 References 6 External links Structure It is interposed between the two other meninges, the more superficial and much thicker dura mater and the deeper pia mater , from which it is separated by the subarachnoid space . The delicate arachnoid layer is not attached to the ins...
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