Hello, the uterus is the organ that produces menstruation and gives birth to the fetus. It is located in the center of the pelvic cavity, between the bladder and rectum. The size of the uterus is related to age and fertility. The unborn fetus is about 7.5 cm long, 5 cm wide and 3 cm thick. The uterus can be divided into three parts: the bottom, the body and the neck. The uterine cavity is an inverted triangle with a depth of about 6cm. I hope my answer is helpful to you.