Weekly Function

Trapezius

Origin:

External occipital protuberance

Along the medial sides of the nuchal line

Ligamentum nuchae (surrounding the cervical spinous processes)

Spinous processes of C1-T12

Insertion:

Posterior, lateral 1/3 of clavicle

Acromion

Superior spine of scapula

Function:

Elevates scapula

Upward rotation of scapula (upper fibers)

Downward rotation of scapula (lower fibers)

Retracts scapula (middle fibers, all fibers co-contracting)