Kidney anatomy. Artwork of a cross-section through a kidney. The kidneys filter waste from the blood and excrete it as urine. The kidney consists of an outer pale cortex and an inner darker medulla. The medulla is divided into regions called the renal pyramids. Each renal pyramid drains into a renal papilla (white). The renal papillae merge to form the ureter (bottom right), which carries the urine to the bladder. Blood is carried to the kidney by the renal artery (red) and away from it by the renal vein (blue).
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