分析探讨神经干复合动作电位

目的：讨论分析蛙神经干动作电位，为电生理实验课教学提供一些创新思路。方法：制备蛙的坐骨神经标本，在原有教学实验设计的基础上，就记录距离。麻药阻滞对神经干复合动作电位的波形、幅度、潜伏期及时程的影响，传导速度的计算方法等问题进行深入分析。结果：增大两记录电极距离，在一定范围内第一相峰值逐渐升高，持续时间延长，第二相峰值逐渐减小，电位持续时间逐渐延长，记录两点间滴加麻药，动作电位的波形第一相峰值逐步加大，第二相逐渐变小，直至消失形成单相动作电位；利用顶点所测速度与起点法测量值不相等。结论：讨论分析该实验结果能更好地使学生理解神经干复合动作电位的原理，牢固掌握基本的电生理知识。

Analysis and discussion of compound action potentials with nerve stem

Objective： Analysis and discussion of compound action potentials with nerve stem, provide some new ideas in electrophysiological teaching. Methods：Prepare the ranine sciatic nerve example, Based on the experimental study,we analysis the effect of record distance and anesthetic block on waveform, amplitude, latency and endurance of compound action potentials, and also discuss the evaluation of conduction velocity. Results： Increasing the distance between two record electrodes, the peak value of the phase 1 rises gradually within the specific limits, duration is lengthenned , the peak value of the phase 2 is reduced gradually, the electric potential lengtheras gradually in duration. Add anaesthetic between two record electrodes, the peak value of the phase 1 rises gradually within the specific limits and the peak value of the phase 2 is reduced gradually,until disappearing and form the single-phase electric potential.The speed which measured by spinnacle and starting point are not equal to. Connclusion：Analysis and discuss this experimental results can make students learn the nerve stem compound action potentials better, and get the electrophysiological knowledge fast.