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ureter
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ureter The Human Body uterus Right and left kidney. organs of the renal system female kidneys in situ; human renal system
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ureter
ureter Cross section of a human ureter as seen through a microscope.

ureter

anatomy
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ureter, duct that transmits urine from the kidney to the bladder. There normally is one ureter for each kidney. Each ureter is a narrow tube that is about 12 inches (30 cm) long. A ureter has thick contractile walls, and its diameter varies considerably at different points along its length. The tube emerges from each kidney, descends behind the abdominal cavity, and opens into the bladder. At its termination the ureter passes through the bladder wall in such a way that, as the bladder fills with urine, this terminal part of the ureter tends to close.

The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Rick Livingston.