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兔心迷走神经传出放电的活动特征

张英才, 张淑华

北京第二医学院生理学教研组. 北京

摘要

兔心迷走神经传出放电有三种类型:1.与后膈神经传出发放同步的节律性放电。这种节律性发放包含两个时相,第一时相大致与膈神经传出放电同时起止,第二时相在膈神经传出发放后期或发放终止时出现。2.持续性放电,出现在上述节律性放电的间歇期。3.偶然出现的高幅高频暴发放电。这种放电出现时,膈神经传出放电即受到明显的压抑。开放预先夹闭的颈总动脉使心迷走神经传出放电增强。窒息、静脉注射肾上腺素使心迷走神经传出放电增强,心率减慢;扩张肺、过度通气、吸入亚硝酸异戊酯使心迷走神经传出放电减少,心率增快。

关键词： 心迷走神经; 传出放电; 心率

Characteristics of efferent discharge activity in cardiac vagal nerve of the rabbit

Zhang Pingcai, Chang Yingtbai

Department of Physiology, Beijing Second Medical College. Beijing, China

Abstract

Three types of discharge pattern were recorded from the cardiac vagal efferent nerve of the rabbit immobilized with flaxedil. 1 .Rhythmic discharges synchronized with the efferent impulses of the phrenic nerve. Two phases were distinguished during each discharge period: the first phase was roughly simultaneous with the phrenic efferent flow, and the second one developed during the later period of the phrenic efferent discharges or immediately after the end of the phrenic discharge. 2. Continuous discharges. 3. Occasional discharges with high amplitude and frequency. The phrenic efferent discharges were obviously depressed whenever the burst appeared. An increase in the activity of the cardiac branch of the vagus could be induced by release of the occluded common carotid arteries. An enhanced discharge in the cardiac vagus and a decreased heart rate could be induced by asphysia and intravenous injection of adrenaline. On the other hand, the vagal discharges could be depressed and the heart rate increased by inflation of the lungs, hyperventilation and amyl nitrite inhalation.

Key words: Cardiac vagus efferent;Discharges;Heart rate

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引用本文：

张英才, 张淑华. 兔心迷走神经传出放电的活动特征[J]. 生理学报 1985; 37 (1): .

Zhang Pingcai, Chang Yingtbai. Characteristics of efferent discharge activity in cardiac vagal nerve of the rabbit. Acta Physiol Sin 1985; 37 (1): (in Chinese with English abstract).