Trapezius muscle
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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