Uterus is the internal reproductive organ of the female and one of the extraordinary organs. It has two major physiological functions. 1) Menstruation: the regular discharge of blood from the uterus upon maturation of female gamete cells. According to traditional Chinese medicine, qi and blood of zang- fu organs and meridians, together with tiangui (heavenly tenth, reproductive stimulating essence), act on the uterus and thus produce menses. The mechanical and physiological integrity of the uterus is directly related to the menstruation. Therefore, the uterus governs menstruation. 2) Conception: When a female reaches reproductive age and begins to ovulate after menarche, the uterus becomes capable of implantation of an embryo.