Subarachnoid Space

**Semantic type:** Body Part, Organ, or Organ Component

**Definition:** The space between the arachnoid membrane and the pia mater; it contains connective tissue, cerebrospinal fluid, and large blood vessels that supply the brain and spinal cord.

**Synonyms:** - SUBARACHNOID SPACE - Subarachnoid - Subarachnoid - Subarachnoid Area - Subarachnoid Area