Which joint is formed by the articulation of the humerus, radius, and ulna?

The joint formed by the articulation of the humerus, radius, and ulna is the elbow joint. This structure is crucial for the functionality of the upper extremity, as it allows for flexion and extension of the forearm relative to the upper arm. The humerus articulates with both the radius and ulna at the elbow, enabling coordinated movements such as lifting and throwing.

In contrast, other joints mentioned in the choices do not involve the humerus in their formation. The wrist joint is primarily formed by the radius and the carpal bones, while the shoulder joint involves the humerus and the scapula. The carpal joints consist of the interactions between the carpal bones themselves. Therefore, the unique combination of the humerus, radius, and ulna distinctly defines the elbow joint.