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 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.
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