Review Question - QID 3799

A 30-year-old female reports neck and right shoulder pain for the last three weeks following a bicycle accident. She complains of pain radiating from her neck into her right forearm and a sensation of numbness in her thumb. On physical examination, she has 4+/5 strength to elbow flexion, 3+/5 strength to wrist extension and supination. Wrist flexion, pronation, shoulder abduction, and thumb extension show normal strength. At which level is a disc herniation likely present, and which nerve root is likely affected?