发生于脊椎动物上的从相对简单的受精卵到高度复杂的幼体和成体这一发展历程,如同发生于其它胚胎上的历程一样,也遵循两个主要的基本机制。第一个重要机制是已经出现在卵和早期卵裂阶段的母本的和(或)爱精卵的成份(卵黄、类脂、生长因子等)的空间分布和时间分布。第二个重要机制一般可以认为是细胞的相互作用SPemann和Mangold(1924)年的关键实验(经典的“组织者”实验)显示,两栖 The development of vertebrates from relatively simple fertilized eggs to highly complex larvae and adults, like those that occur on other embryos, also follows two major underlying mechanisms. The first important mechanism is the spatial and temporal distribution of the components (egg yolk, lipids, growth factors, etc.) of the sperm and / or sperm that have emerged in the egg and early cleavage stages. The second important mechanism can generally be thought of as cell interactions SPemann and Mangold (1924) The key experiment of the year (the classic “organizer” experiment) shows that amphibious