allantois 的定义
Embryology, Zoology.
- a vascular, extraembryonic membrane of birds, reptiles, and certain mammals that develops as a sac or diverticulum from the ventral wall of the hindgut.
更多allantois例句
- The cavity of the allantois, if developed, vanishes completely.
- This bag is called the allantois, and serves as a sort of lung for the developing chick.
- It draws its oxygen and throws off its wastes through the instrumentality of the allantois, which covers it over.
- The blood vessels of the allantois take in oxygen and give out carbon dioxide through the porous shell.
- The allantois of the chick now gains a new development and an altered function.