Which space is located between the arachnoid mater and the pia mater?

The space located between the arachnoid mater and the pia mater is known as the subarachnoid space. This area is critical in neuroanatomy as it is filled with cerebrospinal fluid (CSF), which serves several important functions, including cushioning the brain, providing mechanical protection, and facilitating the exchange of nutrients and waste products between the brain and the blood. The subarachnoid space is also relevant for the circulation of CSF around the central nervous system.

In contrast, the subdural space is the potential space between the dura mater and the arachnoid mater, which, under normal circumstances, does not contain CSF. The supratentorial space refers to the area above the tentorium cerebelli, which separates the cerebellum from the cerebral hemispheres, while the extraventricular space is not a standard term used to describe any recognized area within the brain's protective membranes. Overall, the subarachnoid space is distinct in its role and function within the anatomy of the central nervous system.