)胎膜( fetal membrane) 2羊膜囊 (amnion wolk covey yolk stolk umbilical remnant smooth
2.羊膜囊 (amnion) （一）胎 膜(fetal membrane)
一)胎膜( fetal membrane) 3卵黄囊( yolk sac) of secion At cleese coelom ocher intraembryonic yolk lateral A ventral
3.卵黄囊(yolk sac) （一）胎 膜(fetal membrane)
3卯黄囊( yolk sac) 卵黄管发育异常 (1)回肠憩室 (2)脐瘘
卵黄管发育异常 3.卵黄囊(yolk sac)
(一)胎膜( fetal membrane) 5.脐带 Brain Yolk Branchial arch lacerta U umbilical cord Somites Ar bud Tail bud Leg bud 4 weeks after conception
5. 脐 带 4 weeks after conception （一）胎 膜(fetal membrane)