Flexor Carpi Radialis

Seattle Figure Studio
Sep 18, 2025
Reviewed

Summary

Gray's Anatomy, modified by en:user Selket, Public domain, via Wikimedia Commons

Origins

Insertions

  • Base of the second and third metacarpals

Actions

  • Wrist flexion
  • Wrist abduction

The flexor carpi radialis forms a slender medial border to the wrist's flexor mass. It springs from the medial epicondyle beside the pronator teres, then courses along the forearm with a distinct fascial groove separating it from the palmaris longus. Its long tendon slides through a special tunnel within the flexor retinaculum to reach the bases of the second and third metacarpals.

Acting with flexor carpi ulnaris it flexes the wrist, while its radial pull balances the ulnar vector of that partner to keep the hand level. During gripping the muscle teams with flexor digitorum superficialis. Together they steady the carpus against the opposing force of extensor carpi radialis longus and extensor carpi radialis brevis. Understanding the interplay of these tendons helps artists describe the shifting cords across the ventral forearm.

Related Muscles

References