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The brain and spinal cord are surrounded by three membranous connective tissue layers called the meninges, which include the following (Fig):
Dura mater :
Dura mater is thick outermost meningeal layer that is richly innervated by sensory nerve fibers.
Arachnoid mater :
Arachnoid mater is fine, weblike avascular membrane directly beneath the dural surface; the space between the arachnoid and the underlying pia is called the subarachnoid space and contains cerebrospinal fluid, which bathes and protects the central nervous system (CNS).
Pia mater :
Pia mater is delicate membrane of connective tissue that intimately envelops the brain and spinal cord.