Anatomy Nerves of Upper Extremity 334624a8 Root value of supinator jerk - A C3C4 B C4C5 C C5C6 D C8T1 High-Yield Explanation Ans. is 'c' i.e., C5 C6ReflexRoot valueBiceps reflex (biceps jerk)C5C6Supinator reflex (Supinator jerk)C5 C6Triceps reflex (Triceps jerk)C7C8Knee jerkL3L4Ankle jerkS1S2