DEVELOPMENTAL BIOLOGY A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site trophoblast The tissue that forms the wall of the blastocyst. At implantation the trophoblast forms two layers, an inner cellular layer (the cytotrophoblast) and an outer syncytial layer (the syncytiotrophoblast or plasmoditrophoblast), which erodes the maternal tissue and forms the chorionic villi of the placenta. Related category    • DEVELOPMENTAL BIOLOGY Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP