#arachnoid_membrane__arachnoidmembrane__arachnoid the middle of the 3 meninges
supertype: #meninx__meninges a membrane (one of 3) that envelops the brain and spinal cord
part of: #leptomeninges__leptomeninge the two innermost layers of the meninges; cerebrospinal fluid circulates between these innermost layers
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