外胚层

The primitie mouth, or stomodeum, is a slight depression on the surface of the ectoderm.

原始的口（或口凹）是外胚表面的一个轻微的凹陷。

That is tosay, TaiYinQi corresponds to Endoblast, ShaoYinQi correspond to Mesoderm, JueYinQi corresponds to Ectoderm.

这就是太阴气与内胚对，少阴气与中胚对，厥阴气与外胚对。

Ectodermal dysplasia appears in two froms, hidrotic and anhidrotic, according to clinical features and hereditary characteristics.

外胚异常，临床表徵及遗传特性，可分成无汗型与出汗型两大类。

Bilateral oal thickenings of the surface ectoderm, called nasal placodes, then deelop on each side of the inferior part of the frontonasal prominence.

外胚表面呈双边卵圆形增厚形成鼻板，然后发展成为额鼻隆起的下半部分。