Note the relationship of the urinary, reproductive and digestive structrues. The bladder lies to the right of the uterus (6) and is connected to the urogential sinus (8) by the ureter (1). The rectum (1) is the terminal portion of the digestive system and opens to the outside through the anus (blue arrow). Urogenital apperature ( red arrow) is the external opening of both the urinary and reproductive systems.