Subarachnoid space — Free Anatomy Illustration

Anatomy

Subarachnoid space

A thin, narrow anatomical subarachnoid space shown as a translucent pale-blue fluid-filled gap between two delicate membranes, typically an outer smooth arachnoid layer and an inner closely applied pia layer surrounding neural tissue or a central cord-like structure. The space is elongated or slightly irregular and is crossed by fine cobweb-like arachnoid trabeculae spanning between the boundaries; in some views, small blood vessels traverse the space. The compartment appears as a clear sheath-like sleeve or thin interval with smooth contours and distinct separation from adjacent layers.

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