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Onuf's nucleus

(ŏnəfs)
n.
  1. A nucleus of small somatic motor neurons that are located in the ventral horn of the spinal cord at the level of the second sacral vertebra and innervate the vesicorectal sphincters.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.