SPONTANEOUS EFFERENT IMPULSE AND REFLEX RESPONSE OF THE RECURRENT LARYNGEAL NERVE IN THE CAT AND RABBIT

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1) The spontaneous efferent impulse and the reflex response have been investigated by recording the action potentials in the recurrent laryngeal nerve in the cat and rabbit. 2) The recurrent laryngeal nerve contains three kinds of elements in the discharge patterns, viz., inspiratory, expiratory phasic and tonic. Each group of elements has individually its various discharge types in respect to duration, initiation and termination of the burst discharge in the respiratory cycle. 3) When spontaneous respiratory movements were arrested by succinylcholine, the nerve still exhibited the rhythmic burst. When artificial respiration was carried on, the rhythmic burst began in the early stage of the artificial inflation and terminated before the peak of the artificial inflation. 4) In some experiments a single afferent stimulus of the common peroneal nerve caused a motor discharge in the homolateral recurrent laryngeal nerve. The latencies of the responses were about 16 to 27 msec. In addition, responses occurred occasionally whose latencies ranged from 35 to 42 msec. 5) When the stimulus was applied to the superior laryngeal nerve, the reflex response was distinctly observed in all the experiments. The latencies were about 7 to 11 msec and the durations were about 8 to 14 msec.
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