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chorion (korŽe-on)   an extraembryonic fetal membrane, composed of trophoblast lined with mesoderm; it develops villi, becomes vascularized, and forms the fetal part of the placenta.
 

chorion frondosum  the placental part of the chorion; it is covered by villi.

chorion laeve  the nonvillous, membranous part of the chorion.





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