我们曾报道

隐神经 C 类纤维传入可以到达小脑皮层

引起特异的诱发电位(C-CEP)。其易被镇痛剂吗啡抑制

可以反映慢痛。本文进一步从小脑皮层 C-CEP 作为慢痛反应指标

观察电针足三里穴对其影响

以探讨小脑皮层与电针抑制慢痛的关系。材料与方法实验用猫

体重1.5～3.0kg

雌雄不限。静脉注射1%氯醛糖(80mg/kg)麻醉。气管插管后将猫头固定在脑定位仪上。开颅

暴露小脑皮层

在左侧蚓Ⅵ小叶表面安放单极银球电极引导诱发电位

参照电极置于前额皮下

动物接地。小脑皮层表面复盖38℃石蜡油。分离右侧隐神经

在外周端结扎并剪断之

于近中段分别放置铂丝双极刺激电极、Ag-Ag(?)l 阻断电极和记录电极

Experiments were performed on cats under chloralose anaesthesia and immobilized by Flaxedil.The right saphenous nerve was stimulated with single rectangular electric pulse of 30V and A-fibers were blocked selectively by the anodal current so as to elicic the C-fiber input only.The cerebellar cortical field potential evoked by C-fiber-input (C-CEP) yeas recorded on the contrala-teral vermian Ⅵ lobule surface. C-CEP can be inhibited obviously by injecting the morphine(0.5mg/kg)intravenously

It indicated that C-CEP had the close concern with the slow pain in ormation and might be regarded as the index of the slow pain. The effects of the EA at the “Zusanli” point on C-CEP were observed.The results as following: 1.The amplitude of C-CEP decreased obviously after the EA at the ipsilateral “Zusanli” (strengh:10V

duration:0.2ms

frequence:5Hz). 2.From 5V—30V the more the strength of the EA was

the more the inhibitory efficiency was

3.The inhibitory efficiency of the EA at the ipsilateral “Zusanli” point on C-CEP was stronger than at the contralateral

and the strongest at the bilateral.