yolk sac   (TTS Sound)

The yolk_sac has 2 Senses.

• vesicula umbilicus, umbilical vesicle, yolk sac, vitelline sac
• 卵黄嚢
• membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
• 心臓が機能するまでに哺乳動物の胎児の循環器官として機能する膜構造

• yolk sac
• 卵黄嚢
• membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo
• 鳥、爬虫類、有袋動物とある魚類の卵黄を包む脊椎組織