Subarachnoid space

Definition

The subarachnoid space is the interval between the arachnoid membrane and the pia mater in the brain and spinal cord. It contains cerebrospinal fluid (CSF) which cushions the central nervous system.

5 Must Know Facts For Your Next Test

1. The subarachnoid space is filled with cerebrospinal fluid (CSF).
2. It acts as a cushion to protect the brain and spinal cord from injury.
3. Subarachnoid hemorrhage, a type of stroke, occurs when there is bleeding into this space.
4. This space plays a critical role in maintaining intracranial pressure by circulating CSF.
5. Infections like meningitis can spread through the subarachnoid space, affecting the entire central nervous system.

Review Questions

Related terms

Arachnoid Membrane: The middle layer of the meninges that covers and protects the brain and spinal cord.

Pia Mater:

The delicate inner layer of the meninges that directly covers and adheres to the surface of the brain and spinal cord.

Cerebrospinal Fluid (CSF):

A clear, colorless body fluid found in the brain and spinal cord that cushions these structures from injury.