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
All of the following are affected in low radial nerve palsy except 
Select and explain. 
A. Extensor carpi radialis longus, B. Extensor carpi radialis brevis, C. Finger extensors, D. Sensation on dorsum of hand
A: Extensor carpi radialis longus
Answer: A: Extensor carpi radialis longus 
Explanation: A i.e. Extensor carpi radialis longus Extensor carpi radialis longus muscle is supplied by main trunk of radial nerve above the level of elbow joint; whereas extensor carpi radialis brevis, finger extensors (extensor indics, extensor digitorum, extensor digits minimi) are supplied by its posterior interosseous branch and sensation on dorsum of hand by superficial radial branch below the level of elbow joint.