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.

ORIGIN:

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

INSERTION:

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

ACTION:

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

NERVE SUPPLY:

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

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