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Latissimus Dorsi

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.
  • Adduction.

Innervation

  • Thoracodorsal nerve.

Daily uses

  • Pushing on the arms of a chair when standing up.

Example strengthening exercises

Example stretches

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