Muscle Anatomy

latissimus dorsi

The latissimus dorsi covers a very wide area of the lower half and upper sides of the back.


The latissimus dorsi originates on the spinous processes of the lower thoracic and all the lumbar vertebrae, the back of the sacrum, the crest of the ilium, and the lower three ribs.


It inserts on the upper anterior side of the humerus by a flat tendon attached parallel to the upper portion of the pectoralis major insertion.


Pulls the shoulders downward and to the back.