Subarachnoid space

Definition

The subarachnoid space is an area between the arachnoid mater and pia mater, two of the three meninges that surround the brain and spinal cord. It is filled with cerebrospinal fluid (CSF), which acts as a cushion for the central nervous system, providing protection against injury and facilitating the exchange of nutrients and waste.

Related terms

Cerebrospinal Fluid (CSF): A clear, colorless body fluid found in the brain and spinal cord that acts as a cushion for these structures, providing mechanical and immunological protection.

Meninges:

The three layers of protective tissue called the dura mater, arachnoid mater, and pia mater that encase the central nervous system.

Central Nervous System (CNS): Comprises the brain and spinal cord, serving as the main processing center for the entire nervous system and controlling all functions of the body