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Chorion Frondosum

By: Tim Barclay, PhD
Medically reviewed by: Stephanie Curreli, MD, PhD
Last Updated: Jul 30, 2015

The chorion frondosum is the embryonic portion of the placenta. It consists of finger-like projections, or villi, of the chorion’s surface. The chorion frondosum extends to meet the maternal portion of the placenta, which is composed of the intervillous pool of maternal blood from material arteries and veins; this allows for diffusion of oxygen and of waste gases (such as carbon dioxide) between the Continue Scrolling To Read More Below...

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Continued From Above... membranous layers through a supply of arterial and venous blood from the maternal vessels.

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