[TA] deep back (erector spinae) muscle; origin, angles of upper six ribs; insertion, transverse processes of middle cervical vertebrae; action, extends, abducts, and rotates cervical vertebrae; nerve supply, dorsal branches of upper thoracic nerves. SYN: musculus iliocostalis cervicis/colli [TA], cervical iliocostal muscle, cervicalis ascendens (1), musculus cervicalis ascendens.
