Latissimus dorsi

Definition

The latissimus dorsi is a large, flat muscle on the back that stretches to the sides, behind the arm, and is partly covered by the trapezius on the back near the midline. It is responsible for various movements of the shoulder joint, including extension, adduction, horizontal abduction, and internal rotation.

Related terms

Trapezius: A major muscle of the upper back and neck that moves, rotates, and stabilizes the scapula (shoulder blade) and extends the neck.

Adduction: The movement towards the center of the body; for example, bringing an arm or leg closer to your body's midline.

Internal Rotation: The rotation of a joint toward the middle of the body; in this case, turning an arm so that its thumb moves towards the body