This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peripheral Nerve Injury, Subject name: Orthopaedics
Disability of hands is maximum with a lesion of 
Select and explain. 
A. Median nerve at elbow, B. Median nerve at wrist, C. Ulnar nerve at elbow, D. Ulnar nerve at wrist
C: Ulnar nerve at elbow
Answer: C: Ulnar nerve at elbow 
Explanation: Ulnar nerve innervates 15 of the 20 intrinsic muscles of the hand. Musculocutaneous, radial, ulnar, and median nerves are all impoant to hand function. Musculocutaneous and radial nerves allow forearm supination; the radial nerve alone innervates the extensor muscles. Median nerve is the 'eye of the hand' because of its extensive contribution to sensory perception; it also maintains most of the long flexors, the pronators of the forearm, and the thenar muscles. Ulnar paradox- higher the ulnar nerve injury , less is the clawing of hand