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The vagus nerve contains important afferent fibers as well as efferent ones, playing a role not only in the autonomic reflex but also in the viscerosomatic reflex such as vomiting and respiration. The description of intramedullary courses of the vagus nerve by Ramon y Cajal4) showed vagal afferent fibers entering the solitary tract and descending into the vagal commissure and also their significant contribution to the spinal tract of the trigeminal nerve. By the use of degeneration method or silver impregnation techniques, DuBois5), Ranson, Foley and Alpert1°), Ingram and Dawkins') and Torvik17) also traced the afferent fibers of the vagus nerve. But their results were not always in agreement, because of the difference in the staining method or excessive lesion of the tissue in the operative procedures. In order to observe the origin of the vagal efferent fibers, the retrograde degeneration of the nerve cell has been the most available technique in the study. Bunzel and Ferden3) described that the dorsal nucleus of the vagus nerve was the origin of visceromotor efferent fibers and the ambiguus nucleus was the origin of somato-motor efferents. However, by same staining method, Kosaka and Yagita10) reported that the cardio-inhibitory nerve originated in the ambiguus nucleus. By the use of evoked potential techniques, Anderson and Berry') studied on the intramedullary course of the vagus nerve, agreeing generally with the concept obtained by morphological work. The present experiments have been made to study the potential pattern and topographical arrangement of vagal neurons in the medulla by the unit response analysis, employing microelectrodes.

DISTRIBUTION OF ACTIVATING NEURONS IN MEDULLA OBLONGATA BY STIMULATION OF THE VAGUS NERVE