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yolk sac

中文翻譯：

卵黃囊
【醫】 卵黃囊
　yolk sac

英文解釋：

名詞 yolk sac:

  1. membranous structure that functions as the circulatory system in mammal embryos until the heart becomes functional
    同義詞：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

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