The body of the uterus, forming the superior two thirds of the organ, includes the fundus of the uterus, the rounded part that lies superior to the uterine ostia. The body lies between the layers of the broad ligament and is freely movable. It has two surfaces: vesical (related to the bladder) and intestinal. The body is demarcated from the cervix by the isthmus of the uterus, a relatively constricted segment, approximately 1 cm long.