- Ariconeus: Origin - Distal end of humerus. Insertion - Olecranon process of ulna. Action - Tensor of elbow joint caps.
- Brachialis: Origin - Lateral surface of humerus. Insertion - Proximal end of ulna. Action - Flexes forearm.
- Triceps Branchii: Origin - Scapula and shaft of humerus. Insertion - Olecranon process of ulna. Action - Extends forearm.