Lateral head of triceps brachii
Arms
- Origin
- Back of the humerus above the radial groove
- Insertion
- Olecranon of the ulna
- Action
- Extends the elbow
- Nerve supply
- Radial nerve (C6–C8)
The outer head, forming the visible bulge on the outside of the back of the arm. It acts only at the elbow and works in every press, dip and push-up.