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arachnoid

arachnoid The arachnoid is a thin membrane that surrounds the brain and spinal cord.

The arachnoid is a thin membrane that surrounds the brain and spinal cord. It sits between the dura mater and pia mater, with a fluid-filled subarachnoid space separating it from the pia mater.

Also see

Sources

Drafting source: U.S. National Library of Medicine. Medical Subject Headings (MeSH), 2026 descriptor edition. “Arachnoid” (D001099).
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These citations identify the drafting sources. 2/2 independent reader passes against the pinned source packet. The drafter does not count as a reader. Source institutions do not endorse this dictionary.

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PsychTerms (psychterms.org), CC BY 4.0, version 1. “arachnoid.” Development preview.

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