Subscapularis

Subscapularis

The Subscapularis 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. It is one of the four muscles that comprise the rotator cuff, which stabilizes the shoulder and allows for its movement.

Anatomy

The subscapularis muscle originates from the subscapular fossa of the scapula. It is inserted into the lesser tubercle of the humerus and the lower part of the capsule of the shoulder joint. The muscle is innervated by the subscapular nerves.

Function

The subscapularis muscle has several functions. It is the most powerful of the rotator cuff muscles, and it is the only one that internally rotates the shoulder. It also helps to hold the humeral head in the glenoid cavity, thus stabilizing the shoulder joint.

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 can be caused by overuse, trauma, or degenerative changes. Treatment may include physical therapy, medication, or surgery.

See also

• Rotator cuff
• Shoulder joint
• Scapula
• Humerus

References

Subscapularis Resources
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External links

• Subscapularis muscle at the US National Library of Medicine Medical Subject Headings (MeSH)
• Subscapularis muscle at Kenhub