Skin and nervous system are twins You may ask, what are these strange conclusions? These are the canons by which the human body develops🙌🏻 During embryogenesis, both the nervous system and the future skin are formed from a single germ layer, the ectoderm. In addition, the sensory organs, the epithelium of the anterior and posterior parts of the digestive system, and dental enamel are formed from the ectoderm.