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 as 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. Adduction.
- 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.