刺激大鼠皮神经引起的屈肌反射电位及背根电位

THE FLEXION REFLEX POTENTIAL AND DORSAL ROOT POTENTIAL INDUCED BY STIMULATION OF THE CUTANEOUS NERVE IN THE RAT

本工作以清醒、整体大鼠为对象,记录了刺激皮神经所诱发的屈肌反射电位(FRP)和背根电位(DRP)。分级刺激腓肠神经(皮神经),在hamstring神经干上(一组支配后肢屈肌群的神经)先后诱发出A-FRP和C-FRP,同时在L_5背根上诱发出A-DRP和C-DRP。A-FRP和A-DRP的阈值、潜伏期均无明显差异,且呈有意义的正相关;二者的幅值在一定范围内随刺激强度的增大而增大。C-FRP阈值和潜伏期比C-DRP均较大,但二者的阈值和潜伏期均呈有意义的正相关,且二者的幅值在一定范围内随刺激强度的增大而同步递增。每一串刺激(3个脉冲,间隔5ms,波宽0.5ms)诱发的DRP和FRP值均较相应单刺激诱发的为大,即DRP和FRP均有时间总和现象。

On the intact and awake rat, the flexion reflex potential (FRP)and dorsal root potential (DRP) induced by stimulation of the cutaneous nerve with graded intensity stimulations to the sural nerve (a pure cutaneous nerve) were observed, there appeared A-FRP and C-FRP one after the other on the hamstring nerve (a group of nerves innervating the hindlimb flexors), and A-DRP and C-DRP on the L_5 dorsal root at the same time. The threshold and the latencices of A-FRP and A-DRP had no differences, and had significant positive correlations. The amplitudes of A-FRP and A-DRP increased simultaneously with the increase of the stimulating intensity in certain range. The threshold and latency of C-FRP are larger than those of C-DRP. The threshold and the latency of the C-FRP and C-DRP showed significant positive correlation. The amplitudes of C-FRP and C-DRP increased simultaniously with the increase of the stimulating intensity in certain range. The train stimuli (three pulses, 5ms interval, 0. 5ms duration) induced larger FRP and DRP than those induced by single stimulus. Thus, FRP and DRP both have the property of temporal summation.