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Medical Term:

iliocostalis lumborum (muscle)


Definition: deep back (erector spinae) muscle; origin, posterior aspect of sacrum and thoracolumbar fascia; insertion, the angles of lower six ribs; action, extends, abducts, and rotates lumbar vertebrae; nerve supply, dorsal branches of thoracic and lumbar nerves.

Synonym(s): lumbar iliocostal muscle, musculus sacrolumbalis

© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.