This Urinary System all-in-one-model shows: Structures of retroperitoneal cavity Large and small pelvis with bones and muscles Inferior vena cava Aorta with its branches including iliacal vessels Upper urinary tract Rectum Kidney with adrenal gland. One front half of a kidney is removable from the anatomical model of the urinary system. With easy to change male insert (bladder and prostate, front and rear half) and female insert (bladder, womb and ovaries, 2 lateral halves) the Urinary System model is a great teaching tool. Parts are numbered on the Dual Sex Urinary System. Dual Sex Urinary System model on baseboard.