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
Injury to radial nerve in lower pa of spiral groove: 
Select and explain. 
A. Spares nerve supply to extensor carpi radialis longus, B. Results in paralysis of anconeus muscle, C. Leaves extensions at elbow joint intact, D. Weakens pronation movement
C: Leaves extensions at elbow joint intact
Answer: C: Leaves extensions at elbow joint intact 
Explanation: C i.e. Leaves extension at elbow joint intact Triceps, anconeus are supplied by radial nerve above the level of spiral groove; so these are spared in injuries of radial n. at & below spiral groove thus leaving elbow extension intact Q