yolk sac [胚] 卵黄囊 ; 先后经历了由卵黄囊 ; 探讨卵黄囊 ; 目的探讨卵黄囊
yolk sac tumor 卵黄囊瘤 ; 卵巢内胚层窦瘤 ; 又称卵黄囊瘤 ; 肿疡
secondary yolk sac [胚] 次级卵黄囊
primary yolk sac [胚] 初级卵黄囊 ; 即原始卵黄囊
Yolk sac umbilicus 卵黄囊脐
Yolk sac sarcoma 卵黄囊瘤
yolk sac antigen 卵黄囊抗原
internal yolk sac 内卵黄囊
external yolk sac 外卵黄囊
yolk sac inoculation 卵黄囊接种
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。
I do not believe, however, that this is normal, since in the wild, young with such a large yolk sac probably would not survive without parental protection.
我不相信，不过，这是正常的，因为在野生环境年纪这么大的卵黄囊，也许就不会生存父母的保护。
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。
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