________ Vestigial structure in human embryos

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The allantois is a vestigial structure in the human embryo;it develops during the second week as a diverticulum from the caudal wall of the umbilical vesicle (yolk sac).In some species it serves as a reservoir for excretory products,but in the human embryo it remains small and becomes the urachus in the fetus and the median umbilical ligament in the adult.Although it may contribute to the apex of the urinary bladder,it is believed that the entire bladder develops from the urogenital sinus and the adjacent mesenchyme.

________ Vestigial Structure in Human Embryos