The uterus is located inside the pelvis immediately dorsal (and usually somewhat rostral) to the urinary bladder and ventral to the rectum. The human uterus is pear-shaped and about 3 in. (7.6 cm) long, 4.5 cm broad (side to side) and 3.0 cm thick (anteroposterior). A nonpregnant adult uterus weighs about 60 grams.The uterus can be divided anatomically into four segments: The fundus, corpus, cervix and the internal os.7.6 cm) long, 4.5 cm broad (side to side) and 3.0 cm thick (anteroposterior). A nonpregnant adult uterus weighs about 60 grams. The uterus can be divided anatomically into four segments: The fundus, corpus, cervix and the internal os.