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lumbar iliocostal muscle

n.
  1. A muscle with its origin from the erector muscle of the spine, with insertion to the lower six ribs, with nerve supply from the branches of the thoracic and lumbar nerves, and whose action extends, abducts, and rotates the lumbar vertebrae.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.