1. Triceps brachii - Lateral Head OriginSuperior, lateral margin of humerus Insertion Olecranon process of the ulna Action 2. Triceps brachii - Long Head Origin Infraglenoid tubercle of the scapula Insertion Olecranon process of the ulna Action - Elbow extension
- Shoulder extension
- Shoulder adduction
3. Triceps brachii - Medial Head Origin Posterior surface of humerus, inferior to radial groove Insertion Olecranon process of the ulna Action
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