The Pia mater reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Pia mater

The pia mater (from the Latin 'tender mother') is the delicate innermost layer of the meninges - the membranes surrounding the brain. The pia mater closely envelops the entire surface of the brain, running down into the fissures of the cortex. It joins with the ependyma which lines the ventricles to form choroid plexuses which produce cerebrospinal fluid.

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