Trapezius muscle

Actions of the middle fibers of the trapezius muscle

*adduct scapula *stabilize scapula

Actions of the lower fibers of trapezius

*depress scapula *upwardly rotate scapula

Actions of the upper fibers of the trapezius

*extends head *laterally flex head to same side *rotate head to opposite side *upwardly rotate scapula

Insertion of trapezius

Lateral 1/3 of clavicle, acromion, and spine of scapula

Neurological intervation of trapezius

Spinal accessory nerve

Origin of the trapezius

EOP (external occipital protuberance), medial portion of superior nuchal line of the occiput, spinous processes of C-7 through T-12