Muscles Acting on the Shoulder Joint
Flexors - pectoralis major, anterior deltoid, biceps brachii
Extensors - pectoralis major, posterior deltoid, teres major, trapezius, latissimus dorsi, triceps brachii
Abductors - lateral deltoid, supraspinatus
Adductors - pectoralis major, trapezius, teres major, latissimus dorsi
Internal rotators - pectoralis major, anterior deltoid, teres major, subscapularis, latissimus dorsi
External rotators - posterior deltoid, infraspinatus, teres minor
Scapular elevators - trapezius, rhomboid major & minor
Scapular depressors - pectoralis major, trapezius
Scapular protractors - pectoralis major, serratus anterior
Scapular retractors - trapezius, rhomboid major & minor
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