A- Upper fibers:Bilaterally:Extend the head and neckUnilaterally:Laterally flex the head and neck to the same sideRotate the head and neck to the opposite sideElevate the scapula (scapulothoracic joint)Upwardly rotate the scapula (S/T joint)Middle fibers:Adduct the scapula (S/T joint)Stabilize the scapula (S/T joint)Lower fibers:Depress the scapula (S/T joint)Upwardly rotate the scapula (S/T joint)O- External occipital protuberance, medial portion of superior nuchal line of theocciput, ligamentum nuchae, and spinous processes of C-7 through T-12I- Lateral one-third of clavicle, acromion, and spine of the scapula Your trapezius starts at the base of your neck and goes across your shulders and extends to the middle back TRAPEZIUS