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Shoulder Muscles Taelar Shelton, MS, ATC, AT/L Rotator Cuff Muscles • • • • Supraspinatus Infraspinatus Teres Minor Subscapularis • “SITS” Muscles Supraspinatus • O: Supraspinous foss • I: greater tubercle • A: Assists in abduction, stabilizes shoulder, prevents dislocation Infraspinatus • O: Infraspinous fossa • I: Greater tubercle of the humerus • A: External rotation of the humerus Teres Minor • O: Lateral boder of dorsal surface of scapula • I: greater tubercle • A: external rotation of humerus Subscapularis • O: subscapular fossa • I: lesser tubercle • A: internal rotation of humerus Rhomboids Major • O: Spinous processes T2T5 • I: inferior, medial boarder of the scapula • A: Retracts the scapula Rhomboids Minor • O: spinous process of C7T1 • I: Superior, medial boarder of the scapula • A: Retracts scapula Serratus Anterior • O: Ribs 1-8 • I: Anterior surface of the vertebral (medial) border of the scapula • A: Protracts and holds the scapula against the chest wall
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