What Are The Meninges?

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The meninges are composed of three layers of membranes enclosing the brain and spinal cord. Pia mater is the innermost layer. It is akin to a tissue paper that closely adheres to the brain and spinal cord, dipping into the various folds and crevices. Arachnoid mater is the middle layer. It is a filmy membrane that is joined to the pia mater by fine threads resembling a cobweb. The dura mater, a parchment-like membrane, lies on the outermost part of the meninges and adheres to the skull and spinal canal. The cerebral spinal fluid CSF is the fluid that circulates in the spaces in and around the brain and spinal cord.