Science / Biology / Chorion: The two-layered structure formed from the trophoblast after implantation; secretes human chorionic gonadotropin.

Human Chorionic Gonadotropin (HCG)

Science / Biology / Human Chorionic Gonadotropin (HCG): A peptide hormone secreted by the chorion that prolongs the life of the corpus luteum and prevents the breakdown of the uterine lining. MORE

Chorionic Villi Sampling (CVS)

Science / Biology / Chorionic Villi Sampling (CVS): A method of prenatal testing in which fetal cells from the fetal side of the placenta (chorionic villi) are extracted and analyzed for chromosomal and biochemical defects. MORE

Chorionic Villus Sampling

Science / Genetics / Chorionic Villus Sampling: An invasive prenatal diagnostic procedure involving removal of villi from the human chorion to obtain chromosomes and cell products for diagnosis of disorders in the human embryo. MORE


Science / Spiders / Deutovum: The resting, spiderlike stage following the shedding of the chorion of the egg: the second egg. MORE

Prenatal Testing

Science / Biology / Prenatal Testing: Testing to detect the presence of a genetic disorder in an embryo or fetus; commonly done by amniocentesis or chorionic villi sampling. MORE


Science / Biology / Villi: Finger-like projections of the lining of the small intestine that increase the surface area available for absorption. Also, projections of the chorion that extend into cavities filled with maternal bl MORE