Furuta A, Murakami T
Shigaku. 1989 Aug;77(2):607-17.
The effect of each stimulus pulse to the digastric and masseter muscles activities was examined during the rhythmic jaw movement evoked by repetitive electrical stimulation of the cortical masticatory area and amygdala in the rabbit. The stimulus pulse evoked facilitation and suppression in the digastric muscle activity, and suppression and slight facilitation in the masseter muscle activity. No obvious difference in the pattern of the modulation was appeared between the stimulation of the anterior and posterior cortical masticatory area in the digastric muscle activity. In masseter muscle, the stimulation of the anterior cortical masticatory area showed remarkable suppression only, whereas the stimulation of the posterior cortical masticatory area evoked both suppression and facilitation. Lager motor units were received conspicuous modulation than smaller motor units in both muscles. The time course of these modulation was resembled with those of the masseteric and digastric reflexes by stimulation of the cortical masticatory area. We concluded that the modulation evoked by repetitive electrical stimulation of the cortical masticatory area might be occurred by stimulation of the same pathway as evoking the modulation of reflexes. The repetitive electrical stimulation of the amygdala induced rhythmical jaw movement. In the digastric and masseter muscles, the stimulus pulse evoked facilitation, whereas no obvious suppression was appeared. Lager motor unit was modulated remarkably than smaller unit.
在对兔的皮质咀嚼区和杏仁核进行重复电刺激诱发节律性下颌运动期间，检测了每个刺激脉冲对二腹肌和咬肌活动的影响。刺激脉冲在二腹肌活动中诱发易化和抑制，在咬肌活动中诱发抑制和轻微易化。在二腹肌活动中，刺激皮质咀嚼区前部和后部时，调制模式无明显差异。在咬肌中，刺激皮质咀嚼区前部仅表现出显著抑制，而刺激皮质咀嚼区后部则诱发抑制和易化。在两块肌肉中，较大运动单位比较小运动单位受到的调制更明显。这些调制的时间进程与刺激皮质咀嚼区引起的咬肌和二腹肌反射的时间进程相似。我们得出结论，重复电刺激皮质咀嚼区诱发的调制可能是通过与诱发反射调制相同的通路进行刺激而发生的。杏仁核的重复电刺激诱发节律性下颌运动。在二腹肌和咬肌中，刺激脉冲诱发易化，未出现明显抑制。较大运动单位比较小运动单位受到的调制更显著。
