THE FLEXION REFLEX POTENTIAL AND DORSAL ROOT POTENTIAL INDUCED BY STIMULATION OF THE CUTANEOUS NERVE IN THE RAT / 西安交通大学学报(医学版)

ABSTRACT

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.