Definitions for "Arachnoid mater"
Keywords:  mater, dura, pia, meninges, spinal
One of three meninges covering the central nervous system (CNS) the others are the dura and pia maters. The dura mater encloses the arachnoid which in turn covers the pia mater.
The middle layer of meninges enclosing the brain and spinal cord. It is a thin, translucent layer that adheres to the dura mater.
A thin and rather insubstantial membrane covering of the brain and spinal cord lying between the dura mater and the pia mater.