Root value of knee-jerk -: (A) L1L2, (B) L3L4, (C) L5S1, (D) S1 S2
Answer is B. Ans. is 'b' i.e., L3L4ReflexRoot valueBiceps reflex (biceps jerk)C5 C6Supinator reflex (Supinator jerk)C5 C6Triceps reflex (Triceps jerk)C7 C8Knee jerkL3 L4Ankle jerkS1 S2