The uterus is one member of a thick muscle woman that is above the urinary bladder within the pelvic cavity connected by the two egg channels on each side. Its wall consists of two layers of thick muscle layer surrounding the inner lining layer that encapsulates the uterine cavity from the inside. The egg channel if there is no pregnancy decreases menstruation during the menstrual cycle of women. The size of the uterus of 5-7 cm and increases in the case of pregnancy to about 30 cm (almost the length of the ruler) to keep pace with the growth of the fetus inside. The uterus connects to the vagina through a short, narrow channel known as the cervical region.