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.
- Posterior crest of the ilium (via the Thoracolumbar fascia).
- Posterior sacrum.
- Spinous processes of T7-L5.
- Intertubercular groove (between the greater and lesser tuberosities) of the humerus.
- Shoulder extension.
- Internal rotation.
- Thoracodorsal nerve.
- Pushing on the arms of a chair when standing up.