archenteron

And divided the embryonic development into four main stages: Cleavage, the formation of archenteron notochord and coelomic mesoderm, the formation of embryonic membranes and the organo-genesis;

将胚胎发育主要分为4个时期：卵裂期、原肠脊索与体腔中胚层形成期、胎膜形成期和器官发生期；

When the temperature rose up to 20 ℃, the oocyte could be fertilized but the development of embryos stops at archenteron stage.

在海水盐度23.8ppt、pH8.1、温度20℃的条件下，精卵能受精，但胚胎发育到原肠胚期停止；

The inpocketed vegetal pole cells develop into a sheet of cells which grows upward and eventually encloses a cavity, the archenteron.

内褶的植物极细胞生成一片向上生长的细胞，并最后围成一个腔，即原肠。

The experimental results were as follows: In the combination of grass carp nucleus+ cyprinoid fish cytoplasm, embryos at the archenteron stage were obtained, the yield rate was 1%.

结果，体细胞核移植，在亚科间的组合&草鱼核+鲤质中获得原肠期胚胎，得率为1%；

The roof of the archenteron consists of cells invaginated over the dorsal lip. 3. During neurulation the cells of the dorsal wall of the archenteron form the temporarily existed structures-the back fold and the subnotochord, which soon disappear.

原肠背壁细胞来源于背唇转入层，3.原肠背壁细胞在神经胚形成过程中，形成了短暂存在的原肠背褶和底索。

Early Development of Anura Embryo with Particular Reference to the Formation of the Roof of Archenteron

蛙类的早期胚胎发育，特别着重于原肠背壁形成中的某些问题