Before the division of ancient science, medicine and Yi-ology originated from one school. The knowledge of the human body was once one of the materials of Yi-ology. The cohesion of Yi-ology once said, "Take all the bodies near, and take all the things far away." Yi-ology put the viscera and organs of the human body into the framework of Yi-ology, such as the hexagrams of Yi-ology: "The stem is the head, Kun is the abdomen, the shock is the foot, Xun is the thigh, Kan is the body, away from the eyes, Geng is the head and the mouth is the mouth."