Fetal Membranes, Placenta and Birth defects Jun zhou(周俊) School of Medicine, Zhe Jiang university 20160113
Fetal Membranes, Placenta and Birth defects Jun Zhou（周俊） School of Medicine, ZheJiang University 20160113
Fetal membrane -overview Originate from blastocyst, don'tsoxM Amnion Embryo participate in the formation of yOlk sac embryo Charion Including )Chorion 2)Amnion 3Yolk sac 4)Allantois uMbilical cord Extraembryonic Membranes
Fetal membrane — overview •Originate from blastocyst, don’t participate in the formation of embryo •Including: 1) Chorion 2) Amnion 3) Yolk sac 4) Allantois 5) Umbilical cord
Chorion . Formed by trophoblast +extraembryonic mesoderm e Chorion frondosum (bushy chorion)-embryonic pole o Chorion laeve (smooth chorion)-abembryonic pole Decidua Chorion frondosum connecting ChorionIc cavity Yolk sac -chorionic Decidua Chorion laeve
Chorion •Formed by trophoblast +extraembryonic mesoderm •Chorion frondosum (bushy chorion)- embryonic pole •Chorion laeve (smooth chorion)- abembryonic pole
Development ofⅷi‖l Week 2 to week 3 Primary vill: cytotrophoblast+syncytiotrophoblast Secondary villi: extraembryonic mesoderm enter the primary Tertiary villi extraembryonic mesoderm =>CT+BV 层 駐外中胚层 syncytiotrophoblast Mesoderm core lous capillary c
Development of villi Week 2 to week 3 ▪ Primary villi: cytotrophoblast+syncytiotrophoblast ▪ Secondary villi: extraembryonic mesoderm enter the primary villi ▪ Tertiary villi: extraembryonic mesoderm =>CT+BV
cytotrophoblastic connective tissue tertiar villUS Intervillous space ater blood materna SInus capillaries