What are the three membranes that cover the brain called?

The term that refers to the three membranes covering the brain is "meninges." These membranes consist of three distinct layers: the dura mater, arachnoid mater, and pia mater. Each layer serves specific protective and structural functions for the brain and spinal cord.

The outermost layer, the dura mater, is tough and durable, providing a strong barrier against physical impacts. The middle layer, the arachnoid mater, has a web-like appearance, which allows for the circulation of cerebrospinal fluid (CSF) and serves as a cushion for the brain. The innermost layer, the pia mater, is thin and adheres closely to the surface of the brain itself, offering further protection and support.

Understanding the meninges is essential in the study of brain injuries and other neurological disorders, as they play a key role in protecting the central nervous system and aiding in the maintenance of intracranial pressure. The other terms listed do not pertain specifically to the protective layers around the brain; fasciae are connective tissues, cortexes refer to outer layers of brain regions, and neurons are nerve cells that transmit signals.