The yolk sac is gradually vascularized.

卵黄囊逐渐被血管化了.

The yolk sac and yolk stalk on one of them were well preserved.

观察了三例人胚外形，其中一例还有保存良好的卵黄囊和卵黄蒂。

By two months, the yolk sac becomes redundant and shrivels away.

两个月的时候，卵黄囊就已经失去了作用，慢慢萎缩变小。

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。

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。

ObjectiveTo explore the value of characteristic of gravidas' yolk sac in the early pregnancy outcome of threatened abortion.

目的探讨卵黄囊声像图在早期先兆流产妊娠结局检测中的价值。

Along with the yolk sac absorption, stomach and duodenum, were differentiated 3 days post hatch, respectively.

随着卵黄囊的吸收，仔鱼分别于孵化后第3天分化出胃和十二指肠；

Objective To study the diagnosis and recognition of yolk sac tumor of testis.

目的提高睾丸内胚窦瘤的诊治水平.