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arachnoid membrane

A Dictionary of Biology | 2004 | 283 words | Copyright

arachnoid membrane One of the three membranes (meninges) that surround the brain and spinal cord of vertebrates. It lies between the pia mater and the dura mater. The arachnoid membrane is very delicate and carries cerebrospinal fluid, which sustains and cushions the nervous tissue.

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