The allantois is a membranous sac that develops in the mammalian embryo. It plays a crucial role in the development of the urinary bladder and umbilical cord. The allantois helps in the exchange of gases and nutrients between the embryo and the maternal blood supply. It also plays an important role in the excretion of waste products from the developing embryo.

Role of Allantois in Nutrition

The allantois of the mammalian embryo helps in the transfer of nutrients from the maternal blood supply to the developing embryo. The allantois is rich in blood vessels, which allow for the exchange of nutrients between the embryo and the maternal blood supply. Nutrients such as oxygen, glucose, and amino acids are transported from the mother to the embryo via the allantois.

Role of Allantois in Waste Removal

The allantois also plays an important role in the excretion of waste products from the developing embryo. The allantoic cavity is connected to the cloaca via the allantoic stalk. Waste products such as urea and uric acid are transported from the embryo to the allantois via the umbilical artery. These waste products are then eliminated from the embryo's body via the allantoic stalk and the cloaca.

Conclusion

In conclusion, the allantois of the mammalian embryo plays an important role in the nutrition and waste removal of the developing embryo. It helps in the exchange of gases and nutrients between the embryo and the maternal blood supply. It also plays a crucial role in the excretion of waste products from the developing embryo.

The function of allantois in human embryology is not specific. It is present in a reduced form. Though in other vertebrates like aves and reptiles allantois acts as an extracellular kidney by storing nitrogenous wastes. Thus function is excretory in nature. In other vertebrates allantois is formed from chorion to form the chorioallantoic placenta. It helps the embryo in exchange of gases and nutrition.