This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
In Ulnar nerve injury in arm, all of the following are seen except? 
Select and explain. 
A. Hypothenar atrophy, B. Adduction of thumb, C. Loss of sensation of medial 1/3 of the hand, D. Claw hand
B: Adduction of thumb
Answer: B: Adduction of thumb 
Explanation: Adduction of thumb. Injury to the Ulnar nerve Ulnar nerve is most commonly injured at the elbow, where it lies behind the medial epicondyle and at the wrist where it lies in front of flexor retinaculum. In high ulnar nerve injury at or proximal to elbow, all the muscles supplied by the ulnar nerve in the forearm and hand are paralyzed whereas in low ulnar nerve palsy, there is sparing of the forearm muscles (in flexor carpi ulnaris and flexor digitorum profundus). Sensory deficit are same in both high & low ulnar nerve injury.