Full article: Prenatal Detection of Vesico-Allantoic Cyst: Ultrasound and Autopsy Findings
Prenatal development - Amniotic Sac, Embryo, Fetus | Britannica
Development of the umbilical cord - YouTube
A textbook of obstetrics . Becoming reducedto two arteries and a vein within the allantois itself, they con-stitute the vessels of the umbilical cord, which are destinedto carry the blood of the