Latissimus dorsi
Lats · Back
- Origin
- Spinous processes of T7 to L5, thoracolumbar fascia, iliac crest and lower ribs
- Insertion
- Floor of the bicipital groove of the humerus
- Action
- Extends, adducts and medially rotates the arm
The broadest muscle of the back. It pulls the arm down and back, so it is the prime mover in pull-ups, chin-ups, pulldowns and rows.