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A tongue of tissue within the placenta composed of chorion and containing capillaries connected to the blood circulation in the fetus that laps the mother’s blood in the uterus, exchanging oxygen, nutrients and waste products between the fetus’s blood vessels (in the villi) and the mother’s blood. This tissue is sampled for genetic testing with a CVS (or chorionic villus sampling. See also intervillous space.
Copyright © 1998 Robert
Jansen, WH Freeman / Scientific American Books, and Allen &
Unwin. |
