Flexor carpi radialis muscle

In anatomy, flexor carpi radialis is a muscle of the human forearm that acts to flex and (radial) 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 insertion

This muscle originates on the medial epicondyle of the humerus. 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]

On the anterior aspect of a person's forearm, proximal to the wrist, flexor carpi radialis is the most lateral (closest to the thumb) tendon visible when the wrist is brought into flexion.

Nerve and artery

Like most of the flexors of the hand, FCR is innervated by the median nerve. It gets 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, and wrist curls with dumbbells can also be performed.

See also

Additional images


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