An allantois is a sac which develops in the alimentary canal of the embryos of mammals, birds and reptiles.
allantois
chorion
allantois
The inner cell mass (ICM) produces three embryonic membranes, the amnion, allantois, and the yolk sac.
The allantois is primarily derived from the mesoderm and endoderm germ layers. It develops as an outpouching of the hindgut and is involved in the formation of blood vessels and the urinary bladder. The allantois plays a crucial role in the exchange of gases and waste in the developing embryo, particularly in reptiles and mammals.
allantois
It excretes it into the ALLANTOIS GLAND.
for A+ students like me: The Allantois raynaray
allantois
The allantois membrane and the chorion form the placenta in mammals. The chorion is the outermost fetal membrane that encases the embryo and later fuses with the maternal tissue to form the placenta.
Anatomical terminology. The allantois (plural allantoides or allantoises) is a hollow sac-like structure filled with clear fluid that forms part of a developing amniote's conceptus (which consists of all embryonic and extra-embryonic tissues). It helps the embryo exchange gases and handle liquid waste.
Allantois, amnion, and chorion