Which membrane surrounds the brain and spinal cord?

• A. Dura Mater
• B. The Meninges
• C. Arachnoid
• D. Pia Mater

Answer: (B)

The protective coverings around the brain and spinal cord are the meninges, a set of three membranes that wrap the central nervous system. The outermost layer, the dura mater, is a tough protective sheath. Beneath it is the arachnoid, a web-like middle layer. The innermost layer, the pia mater, lies directly on the surface of the brain and spinal cord. Together, these layers enclose spaces where cerebrospinal fluid circulates, cushioning and safeguarding the CNS. Because the question points to the overall covering, the correct term is the meninges rather than a single layer.