Arachnoid granulations (or arachnoid villi) are small protrusions of the arachnoid (the thin second layer covering the brain) through the dura (the thick outer layer). They protrude into the venous sinuses of the brain, and allow cerebrospinal fluid (CSF) to exit the brain, and enter the blood stream.
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Villus /vil·lus/ pl. vil´li [L.] a small vascular process or protrusion, especially from the free surface of a membrane. arachnoid villi 1. [more]Arachnoid villi - Community and Resources
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