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。
Extraembryonic mesoderm migrates through primitive streak to the presumptive yolk sac between days 6.5 and 7.0 of gestation.
异常卵黄囊的妊娠，预后不良。
Poor prognosis was observed in pregnancies with abnormal yolk sacs.
胚胎卵黄囊表面有一个大圆形油球。
There is a big oil ball on the surface of yolk-sac of perch.
目的：探讨心脏卵黄囊瘤临床病理特征。
Purpose To study the clinicopathological features of yolk sac tumor (YST) of the heart.
卵黄囊瘤很少涉及心包。
卵黄囊逐渐被血管化了。
比较典型的卵黄囊瘤。
该卵黄囊缩小。
目的：探讨CT在性腺外卵黄囊瘤的临床应用价值。
Objective: To explore CT image of yolk sac tumor out of gonad.
结论卵黄囊在评估早期先兆流产结局中有重要价值。
Conclusion Ultrasonography testing yolk sac plays an important role in estimating pregnancy outcome in the early threatened abortion.
结论早孕期对于卵黄囊的超声检测有一定临床意义。
ConclusionThere is some clinical value to diagnose early pregnancy.
染料锥虫蓝对卵黄囊的胞饮作用具有明显的双向作用。
The dye Trypan Blue has a remarkable biphasic effect on pinocytosis by yolk sal.
染料锥虫蓝对卵黄囊的胞饮作用具有明显的双向作用。
The dye trypan blue has a remarkable biphasic effect on pinocytosis by yolk sal .
斑马格局相当鲜明，并卵黄囊开始平平，因为它是吸收。
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。
The zebra pattern is fairly distinct and the yolk sac begins to flatten out as it is absorbed.
同时在卵黄囊表面也可以检测到均匀的呈点状分布的阳性信号。
Its signals can also be detected throughout the surface of yolk sac as presented in pairs of spots.
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。
ObjectiveTo explore the value of characteristic of gravidas' yolk sac in the early pregnancy outcome of threatened abortion.
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。
The yolk sac and yolk stalk on one of them were well preserved.
方法：回顾分析6例经病理证实的性腺外卵黄囊瘤的临床及CT影像表现。
Methods: Retrospectively analyzed clinical manifestation and ct image of yolk sac tumor out of gonad in 6 cases.
目的：探讨监测血清afp对小儿肝母细胞瘤和卵黄囊瘤诊断和预后的意义。
Aim: to investigate the diagnosis and predication value of serum AFP in infants with hepatoblastoma and yolk-sac tumors.
结果：肝母细胞瘤和卵黄囊瘤术前血清AFP阳性率分别为85％，93％。
Results: AFP was significantly increased in 85% patients with hepatoblastoma and 93% patients with yolk-sac tumors.
结论：乙醇可能通过抑制器官发生期脏层卵黄囊的发育诱导胚胎畸形的发生。
CONCLUSION: alcohol exposure in vitro can affect the development of mouse VYS, which may contribute to the teratogenic effect of alcohol.
本文就卵黄囊造血及YS-HSC的增殖、分化及其调控机制的研究进展作一综述。
The progresses in study on yolk sac hemopoiesis as well as the proliferation, differentiation and regulation of the YSHSC are reviewed in this paper.
胚胎癌35例，畸胎瘤11例，卵黄囊瘤3例，绒毛膜上皮癌6例，混合性生殖细胞瘤13例。
There were 35 embryonal carcinomas, 11 teratomas, 3 yolk sac tumors, 6 choriocarcinomas and 13 mixed germ cell tumors.
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。
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.
结论全反式维甲酸可以抑制睾丸卵黄囊瘤细胞的增殖，抑制肿瘤增殖机制可能与下调VEGF的表达有关。
ConclusionATRA could inhibit proliferation of yolk sac tumor cell line, and down regulation of VEGF could be the inhibitory mechanism of ATRA on yolk sac tumor cell line in vitro.
材料和方法：对35例经手术病理证实的骶尾部畸胎瘤和卵黄囊瘤的CT和MRI检查资料进行回顾性分析。
Materials and Method: ct and MRI examinations of 35 children with sacrococcygeal germ cell tumors proved by surgery and pathology were reviewed, retrospectively.
结果表明，在59时龄以内80%以上的卵黄囊营养被吸收利用，说明这一时期是卵黄囊吸收利用的主要时期。
The results showed that more than80%of nutrition in yolk sac were utilized in59hours, which suggested that it was the main period of yolk sac utilization.
MRI显示早早孕、早中期的卵黄囊、胚外体腔、羊膜囊及胎心搏动不如超声（P<0 .0 0 5 ） ；
Ultrasonography had great advantage over MRI in showing yolk sacs, amniotic sacs, extraembryonic coelom and embryocardia-beats ( P< 0.005).
结果研究对象中，20例为未成熟畸胎瘤，11例为卵黄囊瘤，8例为无性细胞瘤，6例为混合性生殖细胞肿瘤。
Result To study patients, 20 immature teratoma (IT), 11 endodermal sinus tumor, 8 dysgerminoma, 6 mixed germ cell tumors.
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