Origin Spinous processes of inferior 6 thoracic vertebrae, thoracolumbar fascia, iliac crest, and inferior 3 or 4 ribs
Insertion Floor of intertubercular groove of humerus
Action Extends, adducts, and medially rotates humerus; raises body toward arms during climbing
Innervation Thoracodorsal nerve (C6, C7, and C8) (C6, C7, C8)
Arterial Supply Thoracodorsal artery

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