yolk sac (ectodermal cells attaching fetus to uterus before the development of the placenta)
trad. 卵黃囊
Also written 卵黃囊【luǎn huáng náng】
yolk sac (ectodermal cells attaching fetus to uterus before the development of the placenta)
trad. 卵黃囊
Also written 卵黃囊【luǎn huáng náng】