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) | 
