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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.