n.胚盘
Daughter nuclei moved towards the egg surface in the form of cometic energids to form blastoderm during the cleavage. 卵裂时子核以“彗星”状活质体向卵表面迁移，形成胚盘；
Somite is divided from head to feet, blastoderm is divided from inner to outer . 由于内脏最早起源于中胚层，根据经络"内属于脏腑"的特点，可以认为经络最早也来源于中胚层。
Furthermore, combining information of our research, it is emphatically introduced about microinjection into chicken, s blastoderm. 其中,结合本实验室的情况,重点介绍了胚盘直接注射法。
Abstract: The early embryonic development of Chanis bilin eata Walker has been described.It includes three stages.The first is the formation of cleavage and blastoderm,the second is germ band and gastru al,and the third is coelom. 文摘:本文研究了豆天蛾早期的胚胎发育过程，历经卵裂与胚盘形成、胚带与原肠形成及体腔发生3个阶段。
After a period of growth, to 4 pm at the blastoderm over the weekend inside and outside the two germ layers, from the ectodermal layer of differentiated cells within the mesoderm to form embryos. 经过一段时间的发育，到4周末时在胚盘内、外两胚层之间，由外胚层分化出一层细胞，形成胚内中胚层。
