Flexor carpi radialis muscle

In anatomy, flexor carpi radialis is a muscle of the human forearm that acts to flex and (radially) abduct the hand. The Latin carpus means wrist; hence flexor carpi is a flexor of the wrist.

Flexor carpi. radialis muscle
Anterior view of the left forearm. Superficial muscles. (Flexor carpi radialis and its tendon visible in blue.)
Anterior view of right upper extremity. (Flex. carp. rad. labeled at upper left.)
Originmedial epicondyle of humerus (common flexor tendon)
InsertionBases of second and third metacarpal bones
ArteryUlnar Artery
NerveMedian nerve
ActionsFlexion and abduction at wrist
AntagonistExtensor carpi ulnaris muscle
Latinmusculus flexor carpi radialis
Anatomical terms of muscle

Origin and insertionEdit

The flexor carpi radialis is one of four muscles in the superficial layer of the anterior compartment of the forearm.

This muscle originates from the medial epicondyle of the humerus as part of the common flexor tendon. It runs just laterally of flexor digitorum superficialis and inserts on the anterior aspect of the base of the second metacarpal, and has small slips to both the third metacarpal and trapezium tuberosity.[1]

The tendon of the flexor carpi radialis is visible on the anterior surface of the forearm, just proximal to the wrist, when the wrist is flexed. It is the tendon seen most lateral, closest to the thumb.

Nerve and arteryEdit

Like most flexors of the anterior compartment of the forearm, FCR is innervated by the median nerve, specifically by axons from cervical nerve roots C6 and C7. The muscle receives its blood supply from the ulnar artery.


The muscle, like all flexors of the forearm, can be strengthened by exercises that resist its flexion. A wrist roller can be used, Zottman Curls, and wrist curls with dumbbells can also be performed.

See alsoEdit

Additional imagesEdit