Abeka Biology Test 3 Practice 2026 - Free Biology Test Questions and Study Guide

The radiocarpal joint is the wrist joint formed where the distal end of the radius meets the proximal row of carpal bones (primarily the scaphoid and lunate). This articulation allows the wrist to move in flexion, extension, and side-to-side deviation. The ulna doesn’t directly articulate with the carpal bones because of the fibrocartilage disc between them. Other options involve joints between different bones: metacarpophalangeal joints connect the hand to the fingers; carpometacarpal joints connect the carpal bones to the metacarpals; intercarpal joints are between carpal bones themselves. Thus, the joint formed by the radius and the proximal carpal row is the radiocarpal joint.