Subscapularis

Musculus subscapularis

Upper Body ShouldersRotator CuffUpper Body

The subscapularis is the largest and strongest rotator cuff muscle and the only one on the anterior surface of the scapula, making it the cuff’s main internal rotator. It resists anterior translation of the humeral head and stabilizes the joint during pressing. Because it is buried against the rib cage it is hard to train in isolation, but internal-rotation drills and balanced pressing keep it strong.

Actions

Shoulder internal (medial) rotation, Shoulder adduction (assists), Stabilization of the glenohumeral joint

Origin

Subscapular fossa (anterior/costal surface of the scapula)

Insertion

Lesser tubercle of the humerus

Innervation

Upper and lower subscapular nerves (C5, C6)

Blood supply

Subscapular artery, suprascapular artery, and circumflex scapular artery (with axillary and lateral thoracic contributions)

Wikipedia ↗

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