thoracic part of iliocostalis lumborum (muscle)
deep back (erector spinae) muscle; origin, medial side of angles of lower six ribs; insertion, angles of upper six ribs; action, extends, abducts, and rotates thoracic vertebrae; nerve supply, dorsal branches of thoracic nerves.
Synonym(s): iliocostalis thoracis (muscle)TA, pars thoracica musculi iliocostalis lumborumTA, musculus iliocostalis dorsi, musculus iliocostalis thoracis
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