Engelsk substantiv: yolk sac | |||
1. | yolk sac (om dyr) membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional | ||
Ord med samme betydning (synonymer) | umbilical vesicle, vesicula umbilicus, vitelline sac | ||
Mindre spesifikke uttrykk | sac | ||
2. | yolk sac (om dyr) membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo | ||
Mindre spesifikke uttrykk | sac | ||