Demonstration model of structure in childbirth - down - bending - rotation - Yang Shen - reduction and external rotation - mechanism of action of the shoulder in normal childbirth. Human birth simulator model for the anatomical study and the practice of diagnostic and therapeutic manipulation during childbirth. Anatomically accurate signal, contours of the uterus and pelvic bone. Simulation of the skin of the birth canal, virtual reality birth scenes. Structure size and design of real people.