Ulnar Nerve Medial cord C7C8 Sensory supply

Both palmar and dorsal surfaces of the ulnar border of the hand.

— Flexor carpi ulnaris

Flexor digitorum profundus

- Adductor pollicis

1st dorsal interosseous

— Flexor carpi ulnaris

Flexor digitorum profundus

- Adductor pollicis

1st dorsal interosseous

/ Flexor

• Opponens J- digiti minimi Abductor

In the upper arm the nerve is closely related to the brachial artery and the median nerve, and passes behind the medial epicondyle of the humerus into the forearm.

In the hand, close to the hamate bone, it divides into deep and superficial branches.

Damaged by:

- Injury at elbow, e.g. dislocation.

- Entrapment at elbow or distal to the medial epicondyle.

- Pressure on the nerve in the palm of the hand damages the deep branch resulting in wasting and weakness without sensory loss.

Results in:

- Weakness and wasting of muscles supplied, with a characteristic posture of the hand - ulnar claw hand - as well as sensory loss. The level of the lesion dictates the extent of the motor paralysis. Nerve conduction studies are helpful in confirming entrapment at the elbow.

Surgical transposition may be necessary in such cases.

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