Flexor carpi ulnaris

The flexor carpi ulnaris (or flexor carpi ulnaris muscle, latin: musculus flexor carpi ulnaris) is a long, superficial muscle of the forearm that belongs to the anterior muscle group and is situated in the first layer.


The flexor carpi ulnaris as the pronator teres originates with two heads: humeral and ulnar.

The humeral head originates from the medial epicondyle of the humerus, but the ulnar head of the flexor carpi ulnaris originates from the medial margin of the olecranon of the ulna.


The flexor carpi ulnaris muscle descends vertically and inserts onto the pisiform bone.


The functions of the flexor carpi ulnaris are flexion and adduction of the hand.


The flexor carpi ulnaris is innervated by the ulnar nerve.