![]() The urogenital ridge is an elevation of mesodermal tissue that gives rise to both the urinary and reproductive systems. The volume of urine produced by an adult averages about 500 ml per day. The volume of urine produced by the adult averages about 1,200 ml a day. Two urethral sphincters regulate the flow of urine from the urinary bladder into the urethra. ![]() The internal urethral sphincter is formed from the detrusor muscle of the urinary bladder and the external urethral sphincter is formed from skeletal muscle fibers. All of the organs of the urinary system are retroperitonea True The kidneys and the ureters are retroperitoneal, but the bladder and urethra are not. The arterial supply to the ureter is from branches of the renal, testicular, (ovarian), and superior vesicular arteries False The superior vesicular artery serves the pelvic region. The testicular (ovarian) artery serves the middle portion. The renal artery serves the superior portion. The effect of gravity causes urine to move through the ureters to the urinary bladder. Muscular peristaltic waves move the urine through the bladder.
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