Rotator

Rotator Cuff

The Rotator Cuff is a group of muscles and their tendons that act to stabilize the shoulder. This system is comprised of four muscles: the supraspinatus muscle, the infraspinatus muscle, teres minor muscle, and the subscapularis muscle. These muscles are responsible for the dynamic stability and movement of the glenohumeral joint.

Anatomy

The rotator cuff muscles originate from the scapula and insert into the humerus. They are named for their location and function. The supraspinatus, infraspinatus, and teres minor muscles are located on the posterior aspect of the scapula, while the subscapularis is located on the anterior (front) aspect.

Function

The primary function of the rotator cuff is to stabilize the glenohumeral joint. Each muscle of the rotator cuff contributes to shoulder movement and stability. The supraspinatus is primarily responsible for abduction of the arm, the infraspinatus and teres minor for external rotation, and the subscapularis for internal rotation.

Clinical Significance

Injuries to the rotator cuff are common and can occur as a result of trauma, degeneration, or overuse. Symptoms of a rotator cuff injury can include pain, weakness, and loss of range of motion in the shoulder. Treatment options for rotator cuff injuries can include physical therapy, medication, and in some cases, surgery.

See Also

• Shoulder joint
• Rotator cuff tear
• Impingement syndrome
• Frozen shoulder

References

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