Which membranes line the brain and spinal cord?

The meninges are the protective membranes that cover the brain and spinal cord. These three layers—dura mater, arachnoid mater, and pia mater—serve several essential functions, including providing a protective barrier against physical impact and infection, as well as containing cerebrospinal fluid which cushions the brain and spinal cord.

Ventricles refer to the fluid-filled cavities within the brain that produce and hold cerebrospinal fluid but do not provide protective covering. Convolutions are the folds in the cerebral cortex that increase the surface area of the brain, contributing to higher brain function but are not membranes. Villi are tiny, hair-like structures involved in absorption processes, primarily in the intestines, and have no relation to the membranes surrounding the central nervous system.

Understanding the role of the meninges is crucial for recognizing how they contribute to the overall protection and functioning of the central nervous system.