Axis | Stable arm | Moving arm | |
---|---|---|---|
Flexion | Lateral aspect of greater tubercle | Axillary line | Lateral epicondyle |
Abduction | Anterior aspect of the acromial process | Axillary line | Medial epicondyle |
External rotation | Olecranon process | Perpendicular to the ground | Ulnar styloid process |
Internal rotation | Olecranon process | Perpendicular to the ground | Ulnar styloid process |