What muscle assists the triceps in elbow extension?

The anconeus muscle plays a supportive role in elbow extension, assisting the triceps brachii. While the triceps are primarily responsible for extending the elbow joint, the anconeus enhances this movement by stabilizing the joint and helping to extend the elbow, particularly during activities that require sustained extension or heavy lifting. Its position at the posterior aspect of the elbow allows it to facilitate the extension alongside the more powerful triceps, making it valuable for effective elbow function during a variety of movements.

The coracobrachialis mainly functions in arm flexion and adduction, while the latissimus dorsi is primarily involved in shoulder movements. The biceps brachii, although it can contribute to elbow flexion and supination, is not an elbow extension muscle, which is why it does not assist the triceps in this specific action.