Latissimus Dorsi

Latissimus Dorsi muscle

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).
Posterior sacrum.
Spinous processes of T7-L5.

Insertion - Intertubercular groove (between the greater and lesser tuberosities) of the humerus.

Actions - Shoulder extension.
Internal rotation.

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.

Related muscles categories: