The Latissimus dorsi muscle is one of the largest in the body. It is a powerful extensor muscle of the arm and is used extensively in chinning and climbing. They are commonly known at the lats.
Origin - Posterior crest of the ilium (via the Thoracolumbar fascia).
Spinous processes of T7-L5.
Insertion - Intertubercular groove (between the greater and lesser tuberosities) of the humerus.
Actions - Shoulder extension.
Innervation - Thoracodorsal nerve.
Daily uses - Pushing on the arms of a chair when standing up.
Example strengthening exercises - Lat pull down using a resistance band.
Example stretches - Latissimus dorsi stretch I.
Latissimus dorsi stretch II.