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Muscles of the shoulder and arm

Shoulder and arm        
 Muscle Origin  Insertion  Action  Notes 
Deltoid Lateral one-third of clavicle, acromion and spine of scapula Deltoid tuberosity of humerus Abduct the shoulder joint

Posterior fibers extend and laterally rotate shoulder. Anterior fibers flex and medially rotate the shoulder.

Origin is identical to the insertion of the trapezius.

"Rotator cuff"

Supraspinatus fossa of scapula Greater tubercle of humerus – superior facet Abducts the humerus; stabilizes head of humerus in glenoid cavity.

Medially rotates humerus, draws it forward and down when arm is raised.

Deep to trapezius-runs underneath the acromion.(only rotator cuff muscle that doesn't rotate)

"Rotator cuff"

Teres Minor

" Rotator cuff"


"Rotator Cuff"

Teres Major        
Serratus Anterior        
Biceps Brachii        
Triceps Brachii        
Pronator teres        
Forearm and hand        
Extensor digitorum        
Pronator quadratus        
Palmaris longus        
Flexor digitorum superficialis        
Flexor carpi radialis        
Flexor carpi ulnaris        
Extensor carpi radialis longus        
Extensor carpi radialis brevis        
Extensor carpi ulnaris        
Flexor digitorum profundus        
Flexor pollicus longus        
Extensor pollicus longus and brevis        
Opponens pollicis        




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