n.外胚层
Any of the blastomeres from which the ectoderm develops. 外裂球任一种发育成外胚层的裂球
An inward fold on the surface of the embryonic ectoderm that develops into part of the anal passage. 原肛肛道胚胎消化道表面的凹陷，发育成直肠的一部分
Derived from two embryonic germ layers, the ectoderm and the endoderm. Used of lower invertebrates, such as sponges and coelenterates. 双胚层的具有两个胚层（外胚层和内胚层）的。用于低等无脊椎动物，如寄生虫和腔肠动物
The resulting gastrula consists of an outer ectoderm, an inner endoderm, and a mesoderm layer positioned between them. 最终原肠胚由一个外肠胚，内肠胚，和一个中肠胚构成。
The primitie mouth, or stomodeum, is a slight depression on the surface of the ectoderm. 原始的口（或口凹）是外胚层表面的一个轻微的凹陷。
The outer layer of a blastula that gives rise to the ectoderm after gastrulation. 外胚层囊胚的外层，在原肠胚形成之后生后外胚层组织
外胚层的
神经外胚层的
