原肠胚形成

细胞的这种向里推进标志着原肠胚形成的开始。

This pushing-in of cells marks the start of gastrulation .

在胚胎发育初期，FGF可诱导原肠胚形成期间的细胞迁移和神经板前后体轴的建立；

FGF control cell migration and establishment of the anterior-posterior body axis of the neural plate during gastrulation .

除了观察正常细胞的原肠胚形成，科学家们还观察了突变细胞。

In addition to looking at normal gastrulation , the scientists also looked at what happens to gastrulation when mutations occur .

外胚层囊胚的外层，在原肠胚形成之后生后外胚层组织随胚的发育和生长，胚乳细胞逐渐解体。

The outer layer of a blastula that gives rise to the ectoderm after gastrulation . Endosperm , cells disorganize gradually along with embryo development .

并就乌龟发育分期的标准，原肠胚的形成，羊膜尾褶和后羊膜管，早期胚胎的自身运动等问题进行了讨论。

The authors discussion the staging parameters of embryonic development , the forming of gastrulation , " ammon tail fold " and " posterior amnion tube " and the forward movement of the embryo itself .

从受精卵到仔鱼出膜可分为卵裂期、囊胚期、原肠期、胚体形成期4个主要阶段，22个发育时期。

From fertilized eggs to newly hatched larvae , can be divided into 4 main stages ; including cleavage stage , blastula stage , gastrula stage and formation of embryo stage , total 22 embryonic development stages .