The highly vascular fetal membrane that consists of the fused chorion and allantois, found adjacent to the eggshell in reptiles and birds and constituting the placenta in most mammals.

 
  • 绒毛膜尿囊由融合的绒毛膜和尿囊组成的富含血管的胎膜组织,存在于爬行类动物和鸟类的蛋壳附近,并且构成大多数哺乳动物的胎盘
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