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Action: Extends arm at shoulder; adducts arm; rotates arm medially Origin - Spinous processes of T7-T12; ribs 9-12; iliac crest; inferior angle of scapula Insertion - Intertubercular groove of the humerus Innervation - Thoracodorsal nerve (C7,8) from the posterior cord of the brachial plexus

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1.
Action: Extends arm at shoulder; adducts arm; rotates arm medially
Origin - Spinous processes of T7-T12; ribs 9-12; iliac crest; inferior angle of scapula
Insertion - Intertubercular groove of the humerus
Innervation - Thoracodorsal nerve (C7,8) from the posterior cord of the brachial plexus





 
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