脊神经节神经元外周突分支对初级感觉传入冲动的影响

实验应用０．７５％的辣根过氧化物酶（ＨＲＰ）充灌玻璃微电极，在蟾蜍脊神经节（ＳＧ）神经细胞进行细胞内电位记录，并注入ＨＲＰ标记被记录细胞，观察细胞的电活动及形态学特征。ＨＲＰ呈色反应的组织学结果表明：ＳＧＡ类细胞外周突有明显分支。电刺激与同一ＳＧ神经元相连的两支脊神经纤维细束，于背根进行轴突内记录，结果观察到传入冲动出现“中断”、“缺失”与“增多”的现象。实验结果显示，ＳＧ神经细胞外周突分支的存在能改变感觉传入冲动的序列和频数。

INFLUENCE OF PERIPHERAL PROCESS BRANCHING IN NERVE OF SPINAL GANGLION ON THE PRIMARY AFFERENT IMPULSE

In order to observe the electrical and morphological characteristics of neurons intoad spinal gsnglion(SG) preperation, microelectrode filled with 0.75% horseradishperoxidase(HRP) was used both for intracellular recording and for intracellular labeling.Histological result showed that there were apparent branchings in peripheral process of A type cells.Intra-axonal recording of the discharges of dorsal root fiber couldbe evoked by simultaneous stimulation of two separate fine bundles in spinal nerve.The discharging event exhibited the petterns of interruption,default and addition. Theabove results suggest that the Peripheral process branching might alter the array and frsquency of primary sensory afferent input.