Origin: Medial superior nuchal line and external protuberance of occipital bone and spinous processes of C7-T12
Insertion: Lateral clavicle and scapula (acromion and scapular spine)
Action: Upper Fibres: elevate and upwardly rotate scapula; extend neck
Middle Fibres: adducts (retracts) scapula
Lower Fibres: depress and help upper fibres upwardly rotate scapula
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| Superior Nuchal Line |
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| External Protuberance of Occipital bone |
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| Spinous Processes |
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| Acromion and Scapula Spine |
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