What movements are possible at the elbow joint?

The primary movement that occurs at the elbow joint is extension, which involves straightening the arm at the elbow. This movement is facilitated by the action of the triceps brachii muscle and is a fundamental motion for various activities, such as pushing or throwing.

While supination and pronation are movements that occur in relation to the forearm and wrist, they are not movements of the elbow joint itself. Supination involves rotating the forearm so that the palm faces up, and pronation involves turning the palm down. Though these actions occur concurrently with elbow movement, they are primarily associated with the radioulnar joints, not the elbow.

Circumduction, which is a circular movement combining flexion, extension, abduction, and adduction, is not a movement that occurs at the elbow joint. Instead, circumduction is typically seen in ball-and-socket joints, such as the shoulder or hip, where greater range of motion is possible.

In summary, while other movements can surround the elbow joint and involve related structures, extension is the specific movement that occurs at the elbow itself, making it the correct answer in this context.