Shoulder

Elevation
Primer movers: Trapezius (Superior/Descending part) & Levator scapulae

Assisting: Mm. rhomoboidei

Video: 30 sec

Trapezius (Accessory nerve, CN XI)

Levator scapulae & mm. rhomboidei (Dorsal scapular nerve)

Depression
Prime movers: Trapezius (Inferior part) & Pectoralis minor

Video: 36 sec

Trapezius (Accessory nerve, CN XI)

Pectoralis minor (Pectoral nerves)

Protraction
Prime movers: Serratus anterior & pectoralis major

Serratus anterior (Long thoracic nerve) Long thoracic nerve injury

Pectoralis major (Pectoral nerves)

Retraction (Scapular adduction)

Prime movers: Mm. rhomboidei

Assisting:  Trapezius (Transverse part)

Mm. rhomboidei (Dorsal scapular nerve)

Trapezius (Accessory nerve, CN XI)

Flexion
Prime movers: Deltoid (anterior part) & Coracobrachialis

Assisting: Pectoralis major & Biceps brachii (Long head)

Video: 60 sec

Deltoid (Axillary nerve)  Axillary nerve injury

Coracobrachialis (Musculocutaneous nerve) Musculocutaneous nerve injury

 Extension 

Prime movers: Latissimus dorsi & Teres major & Deltoid (posterior part)

Assisting: Teres minor & Triceps brachii (Long head)

Video: 24 sec

Latissimus dorsi (Thoracodorsal nerve)  Thoracodorsal nerve injury

Teres major (Subscapular nerve)

Deltoid (Axillary nerve) Axillary nerve injury

Teres minor (Axillary nerve) Axillary nerve injury

Triceps brachii  (Radial nerve) Radial nerve injury

Abduction

Prime movers: Deltoid (Middle part) & Supraspinatus

Assisting: Deltoid (anterior & posterior parts) & Infraspinatus & Serratus anterior

Deltoid (Axillary nerve)  Axillary nerve injury

Supraspinatus (Suprascapular nerve)

Infraspinatus (Suprascapular nerve)

Serratus anterior (Long thoracic nerve) Long thoracic injury

Adduction

Prime movers: Pectoralis major & Latissimus dorsi & Teres major

Assisting: Subscapularis & Triceps brachii (Long head)

Pectoralis major (Pectoral nerves)

Latissimus dorsi (Thoracodorsal nerve) Thoracodorsal nerve injury

Teres major (Subscapular nerve)

Subscapularis (Subscapular nerve)

Triceps brachii (Radial nerve) Radial nerve injury

Medial rotation

Prime movers: Subscapularis & Pectoralis major & Latissimus dorsi & Teres major

Assisting: Deltoid (anterior part)

Subscapularis (Subscapular nerve)

Pectoralis major (Pectoral nerves)

Latissimus dorsi (Thoracodorsal nerve) Thoracodorsal nerve injury

Teres major (Subscapular nerve)

Deltoid (Axillary nerve) Axillary nerve injury

 Lateral rotation 

Prime movers: Infraspinatus & Teres minor

Assisting: Deltoid (posterior part)

Infraspinatus (Suprascpular nerve)

Teres minor (Axillary nerve) Axillary nerve injury

Deltoid (Axillary nerve) Axillary nerve injury