Subscapularis muscle

Subscapularis muscle is a large triangular muscle which fills the subscapular fossa and inserts into the lesser tubercle of the humerus and the front of the capsule of the shoulder-joint.

Anatomy

The Subscapularis muscle originates from the subscapular fossa on the anterior surface of the scapula bone. It is inserted into the lesser tubercle of the humerus. The muscle is innervated by the subscapular nerves.

Function

The Subscapularis muscle is one of the four muscles that comprise the rotator cuff, which stabilizes the shoulder joint. It is responsible for internal rotation and adduction of the humerus.

Clinical significance

Injury to the Subscapularis muscle can result in a loss of ability to internally rotate the shoulder and can cause pain and weakness. This muscle is often overlooked as a source of shoulder pain.

See also

• Rotator cuff
• Subscapular nerves
• Scapula
• Humerus

References

Subscapularis muscle Resources
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