肾脏结构图白板动画

A medical textbook diagram of one human kidney cut in half lengthwise, bean-shaped, centred. The outer layer is a thin light reddish-brown cortex; inside it are six darker triangular cone-shaped medullary pyramids arranged in a ring with their tips pointing inward; the pyramids drain into a hollow funnel-shaped renal pelvis in the inner curve; from the pelvis a single tube, the ureter, runs straight down out of the bottom of the picture. At the inner notch (hilum) one red artery and one blue vein enter the kidney above the ureter. Only this one kidney; nothing else in the picture, no labels. Plain background with lots of empty space, 4:3. Coloured pencil and watercolour marker, clean black ink outlines, warm off-white paper, no text.