Muscles by action
Abduction/Flexion
|
Orienting the glenoid fossaA. Trapezius-also acts as its own antagonist
|
Adduction/Extension
Primary movers
B. Teres major C. Sternal portion of pectorals major |
Accompanying movementsA. Rhomboids
|
Horizontal abduction
B. Teres minor C. Posterior deltoid |
Horizontal adduction
B. Anterior deltoid |
B. Teres minor |
B. Teres major C. Latissimus dorsi D. Pectoralis major |
- These are necessary movements to accommodate movement when the shoulder is at 90° or greater flexion or abduction