Abstract
Single pulse, pulse train, and repetitive stimulation of the cut central end of the cervical vagus nerve initiated periods of depression and facilitation of monosynaptic (masseteric) and polysynaptic (digastric) brain stem reflexes. The excitation of cervical vagal fiber groups of different conduction velocities was examined during these variations in somatic reflex activity. The masseteric and digastric reflex responses were depressed or facilitated in conjunction with the excitation of cervical vagal fibers conducting between 10 and 15m/sec. It was concluded that these fibers were of thoracic origin and that on the basis of their conduction velocity were similar to the vagal fiber system whose excitation induces EEG patterns of activation.
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