#patrick steinmetz

The Evolutionary Origin of Intestines and Muscles

Human and animal bodies consist of a variety of tissues and organs, such as intestines, skin, nervous system and musculature. Interestingly, all these tissues are derived from one of the three “germinal leaves”, which are applied very early in embryonic development by invagination processes. According to the “Keimblatttheorie” skin and nervous system arise from the external ectoderm, the…