BSIP VEM / SCIENCE PHOTO LIBRARY BSIP VEM / SCIENCE PHOTO LIBRARY
Healthy urinary tract. Coloured X-ray urogram of healthy human kidneys, ureters and bladder (coloured green). The two branching structures (top, either side of spine) are the collecting ducts of the kidneys. Descending from these are the ureters, the tubes that carry urine to the bladder. The green area between the hip joints (bottom) is a pool of urine that has collected in the bladder. Urograms are made by injecting the body with a substance that is opaque to X-rays and then taking an X-ray after the kidneys have had enough time to remove this substance from the blood. This test is often carried out to look for abnormalities, such as kidney stones.
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