yolk sac
yolk sac是什么意思、yolk sac怎么讀
yolk sac漢語(yǔ)翻譯
卵黃囊
【醫(yī)】 卵黃囊
【醫(yī)】 卵黃囊
yolk sac英語(yǔ)解釋
名詞 yolk sac:
- 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
- membranous structure enclosing the yolk of eggs in birds reptiles marsupials and some fishes; circulates nutrients to the developing embryo
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