[医] 卵黄囊

词型变化：名词复数形式 : vitelline sacs

vitelline sac的用法和样例：

例句

The yolk sac is gradually vascularized.卵黄囊逐渐被血管化了。
The gonads form from a group of large granulated yolk sac cells which invacle the germinal ridges.性腺是由一群大的颗粒的卵黄囊细胞入缀生殖峭而形成。

【近义词】

yolk sac(=yolk bag)[...
umbilical vesicle脐囊

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