Name
Pronunciation
(FLEK-sur KAR-pi ul-NAR-us)
Origin/Proximal Attachment
Humeral Head: medial epicondyle of the humerus via the common flexor tendon Ulnar Head: medial aspect of olecranon; proximal 3/5 of dorsal ulnar shaft; antebrachial fascia
Insertion/Distal Attachment
Pisiform & hamate bones (via the pisohamate ligament); base of the 5th metacarpal (via the pisometacarpal ligament)
Action/Relevance
Flexes the hand at the wristUlnar deviation of the wristStabilizes wrist to permit powerful thumb motion
Innervation
Ulnar nerve (C8, T1)
Notes
Flexor carpi unlaris arises by two heads, humeral and ulnar, connected by a tendinous arch, beneath which the ulnar nerve and posterior ulnar recurrent artery pass. The humeral head arises from the medial epicondyle of the humerus by the common tendon; the ulnar head arises from the medial margin of the olecranon and from the upper two-thirds of the dorsal border of the ulna by an aponeurosis.