Ford T W, Bennett J A, Kidd C, McWilliam P N
Department of Cardiovascular Studies, University of Leeds.
Exp Physiol. 1990 Jul;75(4):459-73. doi: 10.1113/expphysiol.1990.sp003423.
Extracellular recordings were made from ninety-four single motoneurones in the dorsal motor vagal nucleus of chloralose-anaesthetized or decerebrate cats. Fifty-five neurones had axons in cardiac vagal branches and thirty-nine had axons in pulmonary vagal branches; the conduction velocities of the axons were in the C fibre range, i.e. the axons were non-myelinated. The neurons exhibited little or no spontaneous activity. Excitatory and inhibitory synaptic inputs were demonstrated by electrical stimulation of the vagus nerve or its branches. Twenty-four neurones were tested by carotid sinus distension but only one was excited. Iontophoretic excitation of neurones projecting to cardiac vagal branches had no effect on heart rate. The properties of these neurones and their possible functions are discussed and contrasted with those of cardiac and pulmonary vagal motoneurones in the nucleus ambiguus.
在水合氯醛麻醉或去大脑的猫的迷走神经背核中，对94个单运动神经元进行了细胞外记录。55个神经元的轴突位于心脏迷走神经分支中，39个神经元的轴突位于肺迷走神经分支中；轴突的传导速度在C纤维范围内，即轴突是无髓鞘的。这些神经元几乎没有或没有自发活动。通过电刺激迷走神经或其分支证明了兴奋性和抑制性突触输入。通过颈动脉窦扩张对24个神经元进行了测试，但只有一个被兴奋。对投射到心脏迷走神经分支的神经元进行离子电泳兴奋对心率没有影响。讨论了这些神经元的特性及其可能的功能，并与疑核中的心脏和肺迷走运动神经元的特性进行了对比。
