皮肤电反应为一种交感中枢活动的良好客观指标

它与中枢神经系统的机能活动有着密切关系。汪敬熙曾系统地探讨过脑干网状结构对皮肤电的影响

提出中脑网状结构起易化作用

而延髓网状结构却有着抑制皮肤电反射的效应。本工作采用电刺激内脏大神经向中端模拟内脏痛

以皮肤电反The experiments were performed on 55 cats. The Galvanic Skin Reflex(GSR) caused by splanchnic nerve stimulation was picked up by a pair of silver disc electrodes placed on the foot-pad of the forepaw and recorded on RM-150 polygraph. In order to mimic visceral pain stimuli

the electrical parameter of stimulation of the splanchnic nerve with intensity 3-9V. wave width 0.1 ms. was usually applied in the experiments. The inhibitory effect of electro-acupuncture of "Zusanli" (“足三里”穴) on the splanchnic-GSR was observed in 47 out of 62 experiments on 14 cats(P<0.001). Electrical stimulation of bulbar reticular formation had a similar inhibition effect in 23/31 cats(153 out of 188 experiments). It was found that the amplitude of splanchnic-GSR diminished 33.0% and 35.4% respectively. The inhibitory effect

however

appeared more prompt and efficient when both stimuli were applied simultaneously

decreasing the amplitude of the splanchnic-GSR 57% (P<0.01) The results suggest that some sites in the bulbar reticular formation

including the Nucleus RGC

are activated by the acupuncture signals

and thence descending impulses are transmitted to the spinal cord

thus bringing about an inhibitory effect on visceral pain.