definitions

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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RELATED WORDS

afterbirth, amnion, placenta

Nearby words

arachnidism, arachnodactyly, arachnoid, arachnoid cyst, arachnoid granulation, arachnoid membrane, arachnoid villus, arachnoiditis, arachnology, arachnophobia, arad
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.