Skin and nervous system are twins You may ask, what are some strange conclusions? Such canons guide the development of the human body🙌🏻 During embryogenesis, both the nervous system and the future skin are formed from a single germ layer, the ectoderm. Moreover, the sensory organs, the epithelium of the anterior and posterior parts of the digestive system, and dental enamel are formed from the ectoderm.