Ro J Y, Capra N F
Department of Physiology, University of Maryland Dental School, Baltimore 21201, USA.
Exp Brain Res. 1995;104(3):363-75. doi: 10.1007/BF00231972.
Neurons with orofacial cutaneous receptive fields that responded to jaw movements were recorded in the trigeminal subnucleus interpolaris of the cat. Movement-related neuronal activity was identified by imposing passive ramp and hold stretches of the jaw at four different rates. Thirty-nine neurons with hair (26), skin (9), or convergent (4) receptive fields were studied. Thalamic projection neurons were identified by antidromic stimulation of the ventroposteromedial nucleus of the thalamus. The receptive fields of movement-related hair units included multiple hairs located mainly around the angle of the jaw and chin. The receptive fields of movement-related skin units were smaller than those of hair units and they were located primarily around the angle of the mouth. The convergent units had more than one receptive field that usually included hair or skin. All of the hair units were activated both during opening and closing jaw movements. They typically responded with short bursts of action potentials. Four units with skin receptive fields exhibited similar responses. The five skin units that did not show bursting activity included two that were active during both opening and closing of the jaw, two that were active only during opening, and one that was tonically active during maintained open position. All of the convergent units showed biphasic responses, and three responded with bursts. The maximum discharge rate, the mean discharge rate (mean bursting rate for units with bursting responses), and the total number of spikes per movement were measured. Statistical analysis was performed on these variables to assess functional properties of each unit. The results were used to classify units as velocity, speed, direction, or transient motion detectors. Thirty-three percent of the neurons were trigeminothalamic neurons.
在猫的三叉神经中极核中记录到了对颌运动有反应的具有口面部皮肤感受野的神经元。通过以四种不同速率对颌进行被动斜坡拉伸和保持拉伸来识别与运动相关的神经元活动。研究了39个具有毛发（26个）、皮肤（9个）或汇聚（4个）感受野的神经元。通过对丘脑腹后内侧核的逆向刺激来识别丘脑投射神经元。与运动相关的毛发单位的感受野包括主要位于下颌角和下巴周围的多根毛发。与运动相关的皮肤单位的感受野比毛发单位的小，它们主要位于口角周围。汇聚单位有一个以上的感受野，通常包括毛发或皮肤。所有毛发单位在张口和闭口运动期间均被激活。它们通常以短串动作电位做出反应。四个具有皮肤感受野的单位表现出类似的反应。五个未表现出爆发性活动的皮肤单位包括两个在张口和闭口时均活跃的单位、两个仅在张口时活跃的单位以及一个在保持开口位置时呈紧张性活动的单位。所有汇聚单位均表现出双相反应，其中三个以爆发形式做出反应。测量了最大放电率、平均放电率（对有爆发反应的单位为平均爆发率）以及每次运动的总尖峰数。对这些变量进行统计分析以评估每个单位的功能特性。结果用于将单位分类为速度、速率、方向或瞬态运动探测器。33%的神经元是三叉丘脑神经元。
