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photoelectric intravenous angiography; plasma insulin activity; preinfarction angina; Psychiatric Institute of America; R-phenylisopropyladenosine
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n.
the innermost of the three meninges surrounding the brain and spinal cord. The membrane is closely attached to the surface of the brain and spinal cord, faithfully following each fissure and sulcus. It contains numerous finely branching blood vessels that supply the nerve tissue within. The subarachnoid space separates it from the arachnoid.
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(piґə) (peґə) [L.] 1. tender; soft. 2. pia mater.Medical dictionary. 2011.