Cadden S W, Newton J P, Yemm R
Department of Dental Prosthetics and Gerontology, Dundee Dental Hospital and School, University of Dundee, U.K.
J Oral Rehabil. 1997 Jun;24(6):439-43. doi: 10.1046/j.1365-2842.1997.00515.x.
Electromyographic recordings (EMGs) were made using skin surface electrodes placed over the anterior digastric muscle in seven subjects. In every case, short bursts of electrical stimuli to the upper lip produced a response in the EMG that had a minimum latency of 62.0 +/- 10.8 ms (mean +/- SD). By contrast, no responses were seen when single pulse stimuli were applied. In 6/7 subjects, the minimum stimulation intensity that produced the reflex was described as being sharp or painful. In three additional experiments, single motor units were recorded within the digastric muscle using needle electrodes. In two of these experiments, there was evidence of reflex activity 60-110 ms after the application of painful electrical stimuli to the lip. These findings confirm that perioral stimuli can evoke a digastric reflex in humans and suggest that this reflex requires the summation that results from successive volleys of impulses in a large number of nociceptive afferent neurones.
对7名受试者使用置于二腹肌前肌上方的皮肤表面电极进行肌电图记录（EMG）。在每种情况下，对上唇进行短串电刺激会在肌电图中产生反应，其最小潜伏期为62.0±10.8毫秒（平均值±标准差）。相比之下，施加单脉冲刺激时未观察到反应。在7名受试者中的6名中，产生反射的最小刺激强度被描述为强烈或疼痛。在另外三个实验中，使用针电极在二腹肌内记录单个运动单位。在其中两个实验中，对上唇施加疼痛性电刺激后60 - 110毫秒有反射活动的证据。这些发现证实口周刺激可在人类中诱发二腹肌反射，并表明该反射需要大量伤害性传入神经元中连续冲动群集所产生的总和。
