Latissimus dorsi | ARM MOVERS

The latissimus dorsi is a large, flat muscle on the back that stretches to the sides, behind the arm, and is partly covered by the trapezius on the back near the midline.

The latissimus dorsi,


The latissimus dorsi originates via lumbodorsal fascia into spines of T7-L5, lower 4 ribs & iliac crest.


The latissimus dorsi is inserted at the floor of the intertubercular groove of the humerus.


  1. the agonist of arm extension.
  2. powerful arm adductor.
  3. medially rotates arm & shoulder.
  4. depresses scapula.
  5. pulls the body upward & forward with arms fixed overhead.


The latissimus dorsi is innervated by the sixth, seventh, and eighth cervical nerves through the thoracodorsal (long scapular) nerve.

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