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iliocostal muscle

(ĭl′ē-ō-kŏstəl)
n.
  1. The lateral division of the erector muscle of the spine, having three subdivisions: the lumbar iliocostal muscle, the thoracic iliocostal muscle, and the cervical iliocostal muscle.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.