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chorionic villus |
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villus /vil·lus/ (vil´us) pl. vil´li [L.] a small vascular process or protrusion, especially from the free surface of a membrane. arachnoid villi 1. microscopic projections of the arachnoid into some of the venous sinuses. chorionic villus one of the threadlike projections growing in tufts on the external surface of the chorion. 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. synovial villi slender projections of the synovial membrane from its free inner surface into the joint cavity.
chorionic villus Etymology: Gk, chorion + L, villus, shaggy hair any of the tiny vascular fibrils on the surface of the chorion that infiltrate the maternal blood sinuses of the endometrium and help form the placenta. villus pl. villi [L.] a small process or protrusion, as from the free surface of a membrane. arachnoid villus microscopic projections of the arachnoid into some of the venous sinuses. Called also arachnoid granulations. chorionic villus threadlike projections originally occurring uniformly over the external surface of the chorion. intestinal villus synovial villus slender projections from the surface of the synovial membrane into the cavity of a joint; called also haversian glands. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Both amniocentesis and another procedure called chorionic villus sampling, in which doctors pluck bits of the placenta, isolate fetal cells that can reveal many genetic problems in an unborn baby with near certainty. Chorionic villus sampling, to detect genetic abnormalities in the embryo or fetus in the first trimester. Previously, the only way to know if a woman was having a baby with Down's was with second-trimester blood tests and/or invasive amniocentesis or chorionic villus sampling (CVS) tests, all of which carry a slight risk of miscarriage. |
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