Grimwood P, Appenteng K
Department of Physiology, University of Leeds, UK.
Brain Res. 1995 Aug 21;689(2):299-303. doi: 10.1016/0006-8993(95)00606-q.
We have examined the effect of changes in afferent firing frequency on the monosynaptic EPSP elicited by trigeminal muscle spindle afferents in elevator motoneurones, using both paired pulse and repetitive activation of the masseter nerve. Both modes of stimulation resulted in significant facilitation of EPSP amplitude over intervals of 5-19 ms, but no significant change in EPSP amplitude at either longer or shorter intervals. The facilitation obtained stands in contrast to the predominant depression of EPSP amplitude reported in hindlimb motoneurones following stimulation at decreasing intervals.
我们利用咬肌神经的成对脉冲和重复激活，研究了传入放电频率的变化对三叉神经肌梭传入纤维在提肌运动神经元中引发的单突触兴奋性突触后电位（EPSP）的影响。两种刺激模式在5 - 19毫秒的间隔内均导致EPSP幅度显著增强，但在更长或更短的间隔内EPSP幅度均无显著变化。所获得的这种增强与后肢运动神经元在递减间隔刺激后报道的EPSP幅度的主要抑制形成对比。
