Definition & Meaning of "subarachnoid space"

What is "subarachnoid space"?

The subarachnoid space is a vital component of the central nervous system, located between the delicate arachnoid membrane and the innermost layer called the pia mater. It is filled with cerebrospinal fluid, providing cushioning and protection to the brain and spinal cord. The subarachnoid space also contains numerous blood vessels that supply nutrients and oxygen to the surrounding neural tissue. Its intricate structure and function play a crucial role in supporting the overall health and functionality of the nervous system.