pia mater

Noun
  1. The highly vascular innermost of the 3 meninges (synset 105490452)
    is a type of: meninges, meninx - a membrane (one of 3) that envelops the brain and spinal cord
    is a part of: leptomeninges - the two innermost layers of the meninges; cerebrospinal fluid circulates between these innermost layers

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