BO VEISLAND / SCIENCE PHOTO LIBRARY BO VEISLAND / SCIENCE PHOTO LIBRARY
Ureter. Artwork of a cross-section of the ureter, the tube that carries urine from a kidney to the bladder. The central lumen (white) carries the urine. It is covered in transitional epithelium (dark pink), which is impervious to urine. Next is the submucosa, a layer of connective tissue that contains blood vessels (blue and red). Within the submucosa are 2 layers of muscle, longitudinal (red, inner) and circular (red, outer) which contract to push the urine along the ureter and prevent backflow. The outer membrane, the adventitia (yellow) is composed of fibrous connective tissue.
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