Origin: Spinous processes of lower 6 thoracic vertebrae, ribs and lumber vertebrae
Insertion: Intertubercular groove of humerus
Action: Extension, adduction and medial rotation at shoulder; extends arm at shoulder, adducts arm at shoulder, medially rotates arm at shoulder
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| Latissimus Dorsi |
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| Spinous Processes |
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| Intertubercular Groove of Humerus |
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