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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.





Innervation :


        • Spinal root of accessory nerve (CN XI) (motor) and cervical nerves (C3 and C4) (pain and proprioception).





Arterial Supply :


        • Transverse certical artery.





Depth :


        • Superficial






Action :


        • Elevates, retracts and rotates scapula





        • Superior fibers elevate





        • Middle fibers retract





Target Muscles Target MusclesTrapeziusmuscles