Model shows: Structures of retroperitoneal cavity, large and small pelvis, inferior vena cava, aorta with its branches including iliacal vessels, upper urinary tract, rectum, kidney with adrenal gland. One front half of kidney is removable. With changeable male (bladder and prostate, front and rear half) and female insert (bladder, womb and ovaries, 2 lateral halves). Numbered, on base.