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Flexor carpi radialis

The flexor carpi radialis (Latin: musculus flexor carpi radialis) is a long fusiform-shaped superficial muscle of the upper limb that extends between the humerus and the metacarpal bones. It is one of the wrist flexors and belongs to the anterior muscles of the forearm. It lies in the first (superficial) layer of the anterior forearm compartment.

Forearm muscles (colored), Upper extremity, Muscles, Human arm, Anteromedial view, Dorsolateral view
Muscles of forearm by Anatomy Next
Flexor carpi radialis, Forearm muscles, Muscles of forearm, Muscles of upper limb, Arm muscles, Anterior forearm muscles, Anterior compartment of forearm muscles, Anterior compartment muscles
Flexor carpi radialis by Anatomy Next
Flexor carpi radialis
OriginMedial epicondyle of humerus
InsertionBases of 2nd and 3rd metacarpal bones
Action Flexion and abduction of wrist
InnervationMedian nerve (C6, C7)
Blood supply Anterior or posterior ulnar recurrent arteries, branches of radial artery



The flexor carpi radialis originates from the medial epicondyle of the humerus and further goes obliquely downward to the radial side of the forearm.



The flexor carpi radialis inserts at the bases of the second and third metacarpal bones.



The flexor carpi radialis muscle provides the flexion and abduction of the wrist at the wrist joint.



The flexor carpi radialis is innervated by the median nerve (C6, C7) - a branch of the brachial plexus.


Blood supply

The flexor carpi radialis muscle receives arterial blood supply from the anterior or posterior ulnar recurrent arteries that arise from the ulnar artery. Besides the mentioned arteries, this muscle is also supplied by the branches of the radial artery. The radial artery branches off the brachial artery.