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ilioinguinal nerve

n.
  1. A nerve that arises from the first lumbar nerve, passes through the superficial inguinal ring, and supplies the skin of the upper medial thigh and of the scrotum or of the labia majora.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.