Right shoulder and entire arm burning-muscle/fatigue type pain through tricep and top of forearm when used, with weakness in ring and pinky fingers?

Low cervical prob: Either of 2 possibilities. 1) ulnar nerve compression in the arm or elbow; this would cause numb ring (4) and pinky (5) with weakness in grip. 2) low cervical nerve pressure; would cause symptoms of triceps and forearm and numbness in fingers 4&5. Good exam likely to differentiate, but if in question MRI or emg/nerve conductions would be helpful.