Grades 5-12. Free-standing model comes with four parts and represents the major components of the urinary system. The right kidney is dissected to show the cortex, medulla, pyramids, calyces, pelvis, and origins of the renal artery and vein. The bladder can also be removed and opened for more detailed learning. Durable and a great learning tool in all classrooms and laboratories. 14-1/2 in. x 9 in. x 5 in. model is mounted on a 10-1/2 in. x 7-1/2 in. board.