Bilateral action of the Trapezius
Extend the head and neck
Unilateral Action of the Trapezius
Laterally flex the head and neck to the same side
Rotate the head and neck to the opposite side
Elevate the scapula
Upwardly rotate the scapula
Action of the middle fibers of the Trapezius
Adduct the scapula
Stabilize the scapula
Action of the lower fibers of the trapezius
Depress the scapula
Upwardly rotate the scapula
Origin of the Trapezius
External occipital protuberance
Medial portion of superior nuchal line of the occiput
Ligamentum nuchae and spinous processes of c-7 through t-12
Insertion of Trapezius
Lateral one-third of clavicle, acromion and spine of the scapula