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nei zang da shen jing chuan ru chong dong you fa mao qiu nao hou he dan wei fang dian de guan cha
Author(s): 
Pages: 213-217
Year: Issue:  3
Journal: Acupuncture Research

Keyword:  内脏大神经传入纤维单位放电内脏痛丘脑后核代表区潜伏期自发放电诱发投射区簇放电;
Abstract: The thalamus is a part projected by many kinds of special sensation. Recently, a lot of literature reported that PO nucleus of the thalamus has close relation with pain sensation, but scarcely any materials concerning the function of PO on visceral pain were reported. Experiments were performed on 41 adult cats(2.0-3.9Kg body weight). After anaesthetized lightly with chloralose (60mg/Kg) intravenously, splanchnic nerve was separated extraperitoneally. The skull of the cat was fixed on the stereotaxic apparatus. The surface of the cerebrum was revealed in small area and sealed with agar. We drained the fourth ventricle to keep the cerebrospinal pressure stable. The cats were immobilized With flaxedil and the experiments were carried out under the condition of artificial re- spiration. By means of the stereotaxic apparatus a glass microelectrode (1-μ)was implanted into the PO nucleus of the thalamus. After ligating the efferent end of the splanchnic nerve, it was stimula- ted eith much stronger electric impulse to cause visceral pain. We found out 77 units which showed evoked discharges by stimulating the splanchnic nerve. Two clusters of discharges were found in 40 units of them and three clusters in ll of the total(77). The latent period of the Ist cluster of discharges is 43.4±8.0 msec and the 2nd and the 3rd ones are 257±53 msec, 402±33.5 msec respectively. Either the pattern or the latent period of the discharges are quite dif- ferent from those studied by McLeod and Langenstein in VPL of the thal- amus. Therefore we suppose that PO nucleus might be one of two represent- ative areas of the splanchnic afferent path and it has relations with visc- eral sensation except somatic. Some inhibitory units were also seen in PO. The spontaneous dischar- ges of the neurons decrease and even cease as the splanchnic nerve is sti- mulated. The role of this inhibitory phenomenon requires further study.
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