chorionic

[kor″e-on´ik]

pertaining to the chorion.

chorionic villi numerous branching projections from the external surface of the chorion that provide for exchange between the maternal and fetal circulation. Oxygen and nutrients in the maternal blood diffuse through the walls of the villi and enter the blood of the embryo or fetus. Carbon dioxide and waste products diffuse from blood in the fetal capillaries through the walls of the villi into the maternal blood. See also chorionic villus sampling.

villus

[vil´us] (L.)

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.

chorionic villi see chorionic villi.

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

cho·ri·on·ic vil·li

vascular processes of the chorion of the embryo entering into the formation of the placenta.

Farlex Partner Medical Dictionary © Farlex 2012

cho·ri·on·ic vil·li

(kōr'ē-on'ik vil'ī)

Vascular processes of the chorion of the embryo entering into the formation of the placenta.

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

chorionic villi

The finger-like projections from the CHORION into the wall of the womb at the site at which the PLACENTA is developing. Since both the chorionic villi and the embryo are derived from the same fertilized ovum a sample of the former provides material for genetic studies of the latter. Chorionic villus sampling has become an important method of early pre-natal screening for genetic defects.

Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

Chorionic villi

Microscopic, finger-like projections that emerge from the outer sac which surrounds the developing baby. Chorionic villi are of fetal origin and eventually form the placenta.

Mentioned in: Chorionic Villus Sampling

Mentioned in

References in periodicals archive

These villi will first be composed, externally, of syncytiotrophoblast and a cytotrophoblast nucleus, and will receive the number of primary chorionic villi. Then, the extraembryonic mesoderm arises from the nucleus of the primary villi, at which point they become known as secondary villi.

Caracteristicas Morfologicas de la Placenta Humana y sus Vellosidades Coriales Libres en Gestas Normales y con Diabetes e Hipertension Arterial. Revision de la Literatura

Nicolaides, "Histomorphological features of chorionic villi at 10-14 weeks of gestation in trisomic and chromosomally normal pregnancies," Placenta, vol.

Placental Histomorphology in a Case of Double Trisomy 48,XXX,+18

Of the remaining seven, six were empty gestational sacs, haemorrhagic samples with MCC or macerated samples with absence of chorionic villi; the last sample was excluded owing to a low DNA amount after DNA extraction (<5 ng/[micro]L).

Prenatal BoBs[TM] in the cytogenetic analysis of products of spontaneous miscarriage

Then Handschuh K et al17 compared hCG secretion by primary cultures of VCT and EVCT isolated from the same first trimester human chorionic villi. They proved that invasive EVCT also expressed and secreted high levels of hCG, suggesting a specific paracrine and/or autocrine role for hCG from EVCT origin.17 One way to interpret the present findings is to conclude that invaded by EVCT, uterus wall can be accepted as a rich source of hCG in NIP and this finding cannot be found in EP.

Can ratio of blood/curettage material HCG be used as a reliable method for differentiating miscarriage and ectopic pregnancy?

The lack of a gestational sac or chorionic villi within the specimen made an ectopic pregnancy or GTN unlikely.

Ectopic production of HCG by a benign ovarian mature cystic teratoma simulating an extra-uterine pregnancy: a case report

The most important point about chorionic villi sampling or amniocentesis is the risk of Rh sensitization that it take that mother's Rh- and embryo's Rh+.

Genetic diseases

Once the needle was adequately placed, the chorionic villi were aspirated with a to and fro jiggling movement of the aspiration needle and a suction force was applied through a syringe.

BETA-THALASSEMIA- INSTITUTION BASED ANALYSIS OF ETHNIC AND GEOGRAPHIC DISTRIBUTION, EFFECT OF CONSANGUINITY AND SAFETY OF CHORIONIC VILLUS SAMPLING AS A DIAGNOSTIC, TOOL FOR PRE-NATAL DIAGNOSIS IN SELECTED PATIENTS

It occurs when the chorionic villi invade into the myometrium.

Placenta accreta

The new test can be performed on conventional samples, such as blood and prenatal specimens including amniotic fluid and chorionic villi sampling (CVS).

Genzyme Launches New Diagnostic Test for Cystic Fibrosis Gene

Cells collected from an amniocentesis and chorionic villi sampling is the only way to know with certainty whether your child has any chromosomal abnormality.

Down syndrome demystified