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.
Equivalent to the mouse ectoplacental cone.
Multiple AncestorsSingle AncestorNo DescendantsDevelops fromPart of Parent