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.
© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.