Trapezius Muscle

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Where do the descending fibers of the trapezius INSERT?

Lateral third of the posterior clavicle

Where do the transverse fibers of the trapezius INSERT?

Medial acromion, superior spine of scapula

Where do the ascending fibers of the trapezius INSERT?

Medial spine of the scapula

Where do the descending fibers of the trapezius ORIGINATE?

Medial third of superior nuchal line on occipital bone, external occipital protuberance

What is the ACTION of the entire muscle?

Retracts scapula

What is the ACTION of the transverse fibers of the trapezius?

Retracts scapula

Innervation (trapezius)

Spinal accessory nerve CN XI and (C3, C4, C5 for sensory)

Where does the transverse/middle fibers of the trapezius ORIGINATE?

Spinous processes of C7 to T4

Where do the ascending/lower fibers of the trapezius ORIGINATE?

Spinous processes of T5-T11

What is the ACTION of the ascending fibers of the trapezius?

Depresses scapula

What is the ACTION of the descending fibers of the trapezius?

Elevates scapula


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