In placental mammals, the chorion and the allantois together form the fetal side of the mature placenta. This is a chorioallantoic placenta. Chorion forms part of fetal tissue, allantois becomes ...
The outer membrane, the chorion, contains the amnion and is part of the placenta. On the outer side, the amniotic sac is connected to the yolk sac, the allantois, and via the umbilical cord, the ...
The fetal membranes consist of the chorion, amnion, yolk sac, and allantois. The chorion has three layers: cytotrophoblastic, chorionic connective tissue, and basement membrane. The chorion lies ...