yolk sac

yolk sac是什么意思、yolk sac怎么读

yolk sac英语解释

名词 yolk sac:

1. membranous structure that functions as the circulatory system in mammal embryos until the heart becomes functional同义词：vitelline sac, umbilical vesicle, vesicula umbilicus
2. membranous structure enclosing the yolk of eggs in birds reptiles marsupials and some fishes; circulates nutrients to the developing embryo

yolk sac汉语翻译

卵黄囊
【医】 卵黄囊