PHOTOGRAPHER, VISUALS UNLIMITED / SCIENCE PHOTO LIBRARY PHOTOGRAPHER, VISUALS UNLIMITED / SCIENCE PHOTO LIBRARY
Kidney longitudinal section. Light micrograph of a vertical section through a whole kidney. The kidney is surrounded by a capsule (outer layer) under which is the cortex (purple) consisting mainly of blood vessels and the filtering units (Bowman's capsules). The central medulla (pink) is made up of tubes conveying urine to the medullary pyramids, which open into the renal pelvis (centre right). From here, urine drains into the ureter and to the bladder. This specimen is from a mammal.
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