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1·Extraembryonic mesoderm migrates through primitive streak to the presumptive yolk sac between days 6.5 and 7.0 of gestation.

胚外中胚层在妊娠的第6.5至7.0天之间通过原始条带迁移到推测的卵黄囊。

2·The yolk sac is shrinking.

该卵黄囊缩小。

3·Testicular yolk sac tumor.

比较典型的卵黄囊瘤。

4·The yolk sac is gradually vascularized.

卵黄囊逐渐被血管化了。

5·Yolk sac tumor rarely involves the pericardium.

卵黄囊瘤很少涉及心包。

6·Objective: To explore CT image of yolk sac tumor out of gonad.

目的：探讨CT在性腺外卵黄囊瘤的临床应用价值。

7·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。

8·Purpose To study the clinicopathological features of yolk sac tumor (YST) of the heart.

目的：探讨心脏卵黄囊瘤临床病理特征。

9·The zebra pattern is fairly distinct and the yolk sac begins to flatten out as it is absorbed.

斑马格局相当鲜明，并卵黄囊开始平平，因为它是吸收。

10·The zebra pattern is fairly distinct, and the yolk sac begins to flatten out as it is absorbed.

斑马格局相当鲜明，并卵黄囊开始平平，因为它是吸收。