What is the name of the cobweb-like membrane that covers the brain and spinal cord?

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The term that refers to the cobweb-like membrane covering the brain and spinal cord is "Arachnoid." This membrane is one of the three layers of the meninges, which are protective coverings that surround the central nervous system.

The arachnoid is located between the dura mater, which is the thick outer layer, and the pia mater, the delicate inner layer. Its name is derived from its spiderweb-like appearance. The space beneath the arachnoid contains cerebrospinal fluid, which serves to cushion the brain and spinal cord, providing protection and stability. The arachnoid also plays a role in the circulation of this fluid.

The other choices refer to different layers or structures involved in central nervous system protection. The pia mater is the thin membrane that directly touches the surface of the brain and spinal cord, while the dura mater is the tough outer layer that encases the brain. The epidural refers to a space outside the dura mater, often associated with anesthesia procedures, but it is not a membrane covering the central nervous system.