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Muscles of the Upper Extremity / Trapezius
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| Origin |
Medial third of superior nuchal line; external occipital protruberance, nuchal ligament, and spinous processes of C7 - T12 vertebrae |
| Insertion |
Lateral third of clavicle, acromion, and spine of scapula |
| Action |
Elevates, retracts and rotates scapula; superior fibers elevate, middle fibers retract, and inferior fibers depress scapula; superior and inferior fibers act together in superior rotation of scapula |
| Innervation |
Spinal root of accessory nerve (CN XI) (motor) and cervical nerves (C3 and C4) (pain and proprioception) |
Arterial
Supply |
Transverse certical artery | |
Illustration still under construction |
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