The middle layer of membranes surrounding the brain and spinal column is called

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Because of the vital and essential role of the CNS in the body's regulatory processes, the brain and spinal cord have two protective coverings: an outer covering consisting of bone and an inner covering of membranes called the meninges. The meninges is a collective term for three distinct layers surrounding the brain and spinal column, the dura mater (outermost membrane layer), the arachnoid, and the pia mater (innermost membrane layer).

The Middle Layer of Membranes Surrounding the Brain and Spinal