The chorion frondosum (literally "bushy chorion") arises from the polar pole of the human embryo trophoblast. It consists of a layer of trophblasts and extraembryonic mesoderm surrounded by numerous villi. This portion of the placenta is located at the site of implantation.
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Equivalent to the mouse ectoplacental cone.
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Multiple AncestorsSingle AncestorNo DescendantsDevelops fromPart of Parent