【摘要】 <正> 文昌鱼卵子各胚层之间在发育过程中的相互影响,一直是我们注意的问题。童第周等（1958）认为肌原纤维的分化似与脊索有一定的关系。神经诱导现象的研究更肯定了神经管的产生是外胚层受脊索诱导的结果（童第周等,1961）。32-细胞时期分裂球层的分离和配合（童第周等,1959）表明分离的动物性半球第一层（an₁）只能形成外胚层,植物性半球第二层（veg₂）只能更多还原

【Abstract】 In our previous studies,it was found that in the absence of the notochord,the muscle fibrils of the amphioxus embryo were finer then normal and irregularly arranged.The neural tube,which was induced from the ectoderm by the note- chord,was also absent.Isolation experi- ment showed that the an₁ of the 32-cell stage formed ectoderm only and the veg₂ developed onto the gut and mesoderm. But when an₁ and veg₂ were combined, either an embryo with well formed epider- mis,gut,muscular tissue,notochord and neural tube or a complete,normal embryo was formed.This indicated not only the更多还原