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27.7 MB (596.1 KB compressed)
3413 x 2835 pixels
29.0 x 23.9 cm ⏐ 11.4 x 9.4 in (300dpi)
MR GORDON MUIR / CONSULTANT UROLOGICAL SURGEON / RENAISSANCE HEALTHCARE LTD / SCIENCE PHOTO LIBRARY MR GORDON MUIR / CONSULTANT UROLOGICAL SURGEON / RENAISSANCE HEALTHCARE LTD / SCIENCE PHOTO LIBRARY
Urethral sphincter. Endoscope image of the internal urethral sphincter. This is the group of muscles that surround the opening from the bladder to the urethra, the tube that carries urine out of the body. The sphincter is made up of smooth (involuntary muscle), which is controlled by the autonomic nervous system rather than being under conscious control. The muscles contract to close the opening and relax to open it.
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