What is chorion

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Sia ? 6 years, 5 months ago
The chorion is one of the embryonic membranous structures than encloses both the fetus as well as the amnion. The chorion begins to form chorionic villi towards its outer surface, which initially serves to provide nutrition to the developing embryo.
Part of the chorionic villi arborize more extensively and forms the chorionic frondosum, which in turn gives rise to the placenta.
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