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villus (vilĀ“әs)   a small vascular process or protrusion, as from the free surface of a membrane.
 

arachnoid villi  microscopic projections of the arachnoid into some of the venous sinuses.

intestinal villi  multitudinous threadlike projections covering the surface of the mucous membrane lining the small intestine, serving as the sites of absorption of fluids and nutrients.
Intestinal villus.

Intestinal villus.

synovial villi  slender projections from the surface of the synovial membrane into the cavity of a joint; called also haversian glands.





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