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。

Animal pole : The portion of an egg opposite the vegetal pole that contains the nucleus and most of the cytoplasm .

动物性极：与包含细胞核和多数细胞质的 植物 性 极相对的卵的部分。