blastoderm

Daughter nuclei moved towards the egg surface in the form of cometic energids to form blastoderm during the cleavage.

卵裂子核以“彗星”状活质体向卵表面迁移，形成胚盘；

periblast A layer of tissue between the yolk and cells of blastoderm which is observed as a thin border around blastula.

围胚层在卵黄与眙盘胞之间组织层，被观察到是一个围住囊胚。