பொருள் : Membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional.
ஒத்த சொற்கள் : umbilical vesicle, vesicula umbilicus, vitelline sac
பொருள் : Membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes. Circulates nutrients to the developing embryo.