chorionic villus


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chorionic villus

n.
Any of the minute fingerlike projections of the fetal chorion that contain fetal blood vessels and that combine with maternal uterine tissue to form the placenta.

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
multitudinous threadlike projections covering the surface of the mucous membrane lining the small intestine, serving as the sites of absorption of fluids and nutrients.
Enlarge picture
Organization of an intestinal villus. By permission from Guyton R, Hall JE, Textbook of Medical Physiology, Saunders, 2000
synovial villus
slender projections from the surface of the synovial membrane into the cavity of a joint; called also haversian glands.
References in periodicals archive ?
Achievement of that goal will reduce appreciably the numbers of invasive prenatal diagnostic procedures and potentially banish the techniques of amniocentesis and chorionic villus sampling to the history books.
9) Despite the decrease in HIV transmission with antiretroviral cover, procedures that require more technical skills--such as chorionic villus sampling and cordocentesis--should still be avoided in the HIV-infected woman, as the risk of transmission to the fetus may be considerably increased.
1% of all pregnant women needing referrals for amniocentesis or chorionic villus sampling.
ROAMING FREE Amniocentesis and chorionic villus sampling are currently the only way doctors have for analyzing a fetus' genes, but scientists have for decades been contemplating how to replace these tests with less invasive ones.
About three in five had undergone amniocentesis or chorionic villus sampling; chromosomal abnormalities were the most common indication for pregnancy termination.
The definitive antenatal screening tests for Down's syndrome are amniocentesis or chorionic villus sampling (CVS).
One caveat with first-trimester screening is the need to train a sufficient number of physicians in chorionic villus sampling.
They include amniocentesis, chorionic villus sampling (CVS) and foetal blood sampling.
Institute director Yury Verlinsky, MD said that prenatal testing via amniocentesis or chorionic villus sampling (CVS, which he pioneered) could detect such genetic vulnerabilities to cancer when the fetus is in the womb.
Considered just as invasive as amnio, chorionic villus sampling, or CVS, requires a catheter to be inserted into the abdomen or vagina to take a tissue sample from the placenta.
Now they can study the fetus as early as the ninth to 12th weeks of pregnancy with the chorionic villus sampling test.
Caroline McGuirk, project coordinator of the Chorionic Villus Sampling Birth Defects Registry at Massachusetts General Hospital in Boston, said, "Many women have CVS, and many of their children do not have birth defects.