Characteristic of ulnar nerve :
- Has no branches above the elbow
- Innervates the adductor pollicis muscle
- Innervates the first dorsal interosseus muscle
- Innervates the medial half of the flexor digitorum profundus (FDP)
- Originates from the medial cord of the brachial plexus
More information of ulnar nerve :
Originating in the brachial plexus it descends down the arm before passing around the medial epicondyle of the elbow (the so-called funny bone) and then passes between the heads of flexor carpi ulnaris.
It gives some cutaneous branches just before the wrist whilst the motor branches pass around the hook of hamate.
Its motor contribution is to all small muscles of the hand except the lateral two lumbricals as well as FCU and FDP.
Its sensory supply is to the one and a half ulna side fingers.
Ulnar neuropathies: where, why, and what to do? — Stewart 6 (4): 218 — Practical Neurology
The diagnostic value of provocative clinical tests in ulnar neuropathy at the elbow is marginal — Beekman et al. 80 (12): 1369 — Journal of Neurology, Neurosurgery Psychiatry
Musculoskeletal ultrasound education for sports medicine fellows: a suggested/potential curriculum by the American Medical Society for Sports Medicine — Finnoff et al. 44 (16): 1144 — British Journal of Sports Medicine