Final answer:
In the wrist joint proper, or radiocarpal joint, the proximal row of carpal bones consisting of the scaphoid, lunate, and triquetrum (excluding the pisiform) articulate with the radius. The distal carpal bones are involved in the midcarpal joint and do not directly contribute to the radiocarpal joint.
Step-by-step explanation:
Carpal Bones Involved in the Wrist Joint
The wrist joint proper, also known as the radiocarpal joint, is primarily formed by the articulation of the proximal row of carpal bones with the distal end of the radius (and a fibrocartilaginous pad adjacent to the ulna). These bones include the scaphoid, lunate, and triquetrum (excluding the pisiform as it articulates with the anterior surface of the triquetrum bone). The scaphoid and lunate bones articulate directly with the distal end of the radius, while the triquetrum articulates with a fibrocartilaginous pad that spans the radius and the styloid process of the ulna. The distal row of carpal bones, which includes the hamate, capitate, trapezoid, and trapezium, is primarily involved in forming the midcarpal joint and articulates with the metacarpal bones of the hand but does not directly contribute to the radiocarpal joint.