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。
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.
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。
Yolk sac tumor rarely involves the pericardium.
卵黄囊瘤很少涉及心包。
There were 35 embryonal carcinomas, 11 teratomas, 3 yolk sac tumors, 6 choriocarcinomas and 13 mixed germ cell tumors.
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。
The progresses in study on yolk sac hemopoiesis as well as the proliferation, differentiation and regulation of the YSHSC are reviewed in this paper.
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 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.
斑马格局相当鲜明，并卵黄囊开始平平，因为它是吸收。
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。
该卵黄囊缩小。
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。
Methods: Retrospectively analyzed clinical manifestation and ct image of yolk sac tumor out of gonad in 6 cases.
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。
Objective: malignant germ cell tumors occur in childhood at a rate of 2 to 3 cases per million children, and Yolk sac tumor accounts for the most (62.7%) of malignant germ cell tumors.
目的：儿童恶性生殖细胞肿瘤的发病率是百万分之二到三，卵黄囊瘤是其中最常见的儿童恶性生殖细胞肿瘤，约占62.7%。
Results: AFP was significantly increased in 85% patients with hepatoblastoma and 93% patients with 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％。
Its signals can also be detected throughout the surface of yolk sac as presented in pairs of spots.
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。
The yolk sac is gradually vascularized.
卵黄囊逐渐被血管化了。
The hematopoietic and vascular systems of the mouse arise from extraembryonic mesoderm that migrate through primitive streak to the presumptive yolk sac between days 6.5 and 7.0 of gestation.
小鼠的造血和血管系统起源于胚外中胚层。胚胎期6.5-7天时在卵黄囊形成特征性的血岛结构发生向造血和内皮细胞的分化。
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。
Conclusion Ultrasonography testing yolk sac plays an important role in estimating pregnancy outcome in the early threatened abortion.
结论卵黄囊在评估早期先兆流产结局中有重要价值。
Results The detection rate of mass, yolk sac, embryonic bud, embryonic heartbeat and ovary was higher in the TVS or TAS TVS test than those in the TAS test (P<0.01).
结果TVS及TAS TVS对附件区包块、卵黄囊、胎芽、胎心搏动、宫内假孕囊、卵巢的检出率远较TAS高，差异均有统计学意义（P<0.01）。
Aim: to investigate the diagnosis and predication value of serum AFP in infants with hepatoblastoma and yolk-sac tumors.
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。
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.
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。
There is a big oil ball on the surface of yolk-sac of perch.
胚胎卵黄囊表面有一个大圆形油球。
比较典型的卵黄囊瘤。
The results indicated that the fertilized eggs in blastula stage and yolk-sac larva of Paralichthys olivaceus were more sensitive to algal toxin than those in other development stages.
实验结果表明，原肠期前的发育卵和初孵仔鱼对赤潮异弯藻较其他发育阶段更为敏感。
The results indicated that the fertilized eggs in blastula stage and yolk-sac larva of Paralichthys olivaceus were more sensitive to algal toxin than those in other development stages.
实验结果表明，原肠期前的发育卵和初孵仔鱼对赤潮异弯藻较其他发育阶段更为敏感。
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