卵黄囊

luǎn huáng náng

释义

1. yolk sac (ectodermal cells attaching fetus to uterus before the development of the placenta)

卵黄囊 的构成词

• 卵 luǎn: egg
• 黄 huáng: yellow
• 卵黄 luǎn huáng: egg yolk
• 囊 náng: sack