opens like a book The vinyl-plastic reproduction kidney anatomy model, complete with adrenal gland and proximal portion of the ureter, swings open to expose its internal anatomy, including: the cortex, medulla, major and minor calyces, renal columns, pelvis and the ramifications of the renal artery and vein. Features are hand-numbered and identified in a corresponding key. Hinged kidney fully rotates on hardwood base or can be removed for hands-on study. Overall dimensions: 5x5x11 inches (13x13x28 cm).