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Latissimus Dorsi

Origin: T6-12, L1-5, Ribs 8-12, Thoracolumbar fascia, Iliac Crest, Scapula (inferior angle, only 20% of population)

Insertion: Humerus (Intertubercular groove)

Action: Shoulder Adduction, Extension, Internal Rotation

Innervation: C6-8 (Thoracodorsal Nerve)

 

EMG studies: