Shoulder Synergists (Glenohumeral Joint)

Question 1

(Glenohumeral) Shoulder Flexion

Answer 1

Deltoid (anterior fibers)- Axillary nerve
Pectoralis major (upper fibers)- lateral pectoral nerve
biceps brachii- musculocutaneous nerve
coracobrachialis- musculocutaneous nerve

Question 2

(Glenohumeral) Shoulder Extension

Answer 2

Deltoid (posterior fibers) - Axillary nerve
Latissimus Dorsi- thoracodorsal nerve
Teres Major- Lower subscapular nerve
Pectoralis Major (lower fibers)- lateral and medial pectoral nerve
Triceps brachii (long head)- radial nerve

Question 3

(Glenohumeral) Shoulder Horizontal Abduction

Answer 3

Deltoid (posterior fiber)- Axillary Nerve

Question 4

(Glenohumeral) Shoulder Horizontal Adduction

Answer 4

Deltoid (anterior fibers)- Axillary Nerve
Pectoralis Major (upper fibers)- Lateral pectoral nerve

Question 5

(Glenohumeral) Shoulder Abduction

Answer 5

Deltoid (all fibers)- Axillary nerve

Supraspinatus- Suprascapular nerve

Question 6

(Glenohumeral) Shoulder Adduction

Answer 6

Latissmus Dorsi- Thoracodorsal nerve
Teres major- lower subscapular nerve
Infraspinatus- subscapular nerve
Teres minor- axillary nerve
Pectoralis major (all fibers)- lateral and medial pectoral nerve
Triceps brachii (long head)- radial nerve
Coracobrachialis- musculocutaneous nerve

Question 7

(Glenohumeral) Lateral Shoulder Rotation (external rotation)

Answer 7

Deltoid (posterior fibers)- Axillary nerve
Infraspinatus- Suprascapular nerve
Teres minor- Axillary nerve

Question 8

(Glenohumeral) Medial Shoulder Rotation (internal rotation)

Answer 8

Deltoid (anterior fibers)- Axillary nerve
Latissimus dorsi- Thoracodorsal nerve
Teres major- Lower Subscapular nerve
Subscapularis- Upper and lower Subscapular nerve
Pectoralis Major (all fibers)- lateral and medial pectoral nerve