Question
Which is regarded as the urinary bladder of the embryo?
Amnion
Allantois
Chorion
Yolk sac
Solution
B.
Allantois
Allantois is an extraembryonic membrane developed as an outgrowth from hindgut. In the eggs of reptiles and birds, it functions as a urinary bladder and stores the waste excretory products. It also provides oxygen (in reptiles, birds and mammals) and food (in mammals) to the embryo.
