A collective term used for the three layers of membranes surrounding the brain and spinal column is the:
a. dura mater.
b. meninges.
c. arachnoid.
d. pia mater.
B
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).
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