Lisý L
Katedra neurológie ILF, Bratislava.
Cesk Neurol Neurochir. 1991 Mar;54(2):96-101.
In a group of healthy subjects the author evoked reflex responses in both masseters by percussion of the chin with a reflex hammer. The reflexes were evoked during relaxation, slight or intense contraction of the masseters with the mouth open or closed. By percussion of the chin from above extension reflexes were evoked and by percussion of the chin from below contracting reflexes. The response was recorded by means of an electromyographic apparatus. The short-term stretch responses were evoked from the relaxed and slightly contracted masseters with the mouth open or closed. During intense contraction of the masseters the short-latency reflex stretch response was not evoked. In that case at first a short-latency inhibition of the basal activity of the masseter was observed followed by a medium and late-latency excitation response. With the masseters relaxed a long-latency stretch response was observed only with the mouth open. Percussion of the chin from beneath with slight contraction of the masseter caused initial inhibition of its basal activity followed then by a short-latency excitation response. Based on the assembled results the author analyzed the mechanism of the reflex control of the masseters.
在一组健康受试者中，作者用反射锤轻敲下巴，诱发双侧咬肌的反射反应。反射在咬肌放松、轻微收缩或强烈收缩时诱发，同时嘴巴张开或闭合。从上方轻敲下巴可诱发伸展反射，从下方轻敲下巴则诱发收缩反射。反应通过肌电图仪记录。短期牵张反应在咬肌放松和轻微收缩时诱发，此时嘴巴张开或闭合。在咬肌强烈收缩时，未诱发短潜伏期反射性牵张反应。在这种情况下，首先观察到咬肌基础活动的短潜伏期抑制，随后是中潜伏期和长潜伏期兴奋反应。当咬肌放松时，仅在嘴巴张开时观察到长潜伏期牵张反应。在咬肌轻微收缩时从下方轻敲下巴，会导致其基础活动最初受到抑制，随后是短潜伏期兴奋反应。基于汇总结果，作者分析了咬肌反射控制的机制。
