| 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
|
The medical illustrations contained in this online atlas are copyrighted © 1997 by the University of Washington.
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