Name

# Flexor Carpi Ulnaris

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.