The latissimus dorsi muscle
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The latissimus dorsi muscle consists of a pair of large, flat muscles of the back, each attached by a tendon to the humerus near its upper end just beneath the shoulder on the medial side of the intertubercular groove (Gamboa, 2002; Vogel, 2001, 92-93). The muscle widens out below the tendon and runs under the lower part of the shoulder blades toward the middle of the back, attaching to the bony rearward extensions of the lower thoracic (T6-T12) and lumbar vertebrae and the iliac crest through a flat tendonous sheet. The latissimi work with other muscles to swing the arm downward and backward. They extend, adduct and medially rotate the humerus, and raise the body towards the arms during climbing (Richardson, 2004). Shoulder adduction by the latissimus dorsi also uses the pectorals; horizontal extension of the shoulder involve
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