Paroximal injury in 77 cases, distal injury in 10 cases, extensive injuries in 47 cases and likely combined with brainstem and/or trigeminal nerve injury in 50 cases were detected by the ratio of R1/M and blink reflex.

• 根据患侧R1/M潜伏期比值及瞬目反射提示77例表现为茎乳孔内段损害,10例为茎乳孔外段损害,47例为面神经广泛受损,50例提示可能合并脑干和(或)三叉神经损害。