Flexor Carpi Ulnaris

hand-muscles-anterior-2-labeledMuscle Origin

Medial epicondyle of the humerus to pisiform, hamate and fifth metacarpals.

Flexor carpi ulnaris muscle origin is the medial epicondyle (common flexor tendon) and medial margin on the olecranon of ulna. There are two heads of the Flexor carpi ulnaris, the humeral head attaches to the medial epicondyle of the humerus and the ulnar head attaches from the olecranon process and the proximal posterior ulna. American Academy of Manuel Medicine


Pisiform, hook of the hamate, base of the fifth metacarpal bone.

Its insertion is into the pisiform bone and then via ligaments into the hamate bone-g pisohamate ligament- and 5th metacarpal bone-forming pisometacarpal ligament. Its action is to flex and adduct the wrist joint. Wiki


Flexes wrist.

Flexes and adducts the wrist and the hand, and aids with flexion of the forearm.

Innervation – Nerve control

Muscular branches of ulnar nerve.

The FCU is innervated by the ulnar nerve which has its roots in the C7, C8 and T1 spinal nerves.


Ulnar artery.

The ulnar artery is the main blood vessel, with oxygenated blood, of the medial aspect of the forearm. It arises from the brachial artery and terminates in the superficial palmar arch, which joins with the superficial branch of the radial artery. It is palpable on the anterior and medial aspect of the wrist. Wiki

Antagonist muscles

Extensor carpi radialis brevis muscle and extensor carpi radialis longus muscle.

Abductor pollicis longus, Flexor digitorum superficialis and profundus, Flexor pollicis longus.

Pictures of muscles


Trigger Point Referrals


Stretching description








Additional Resources
Sports Lab
American Academy of Manuel Medicine

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