THE NERVE PATHWAYS INVOLVED IN THE PALATINE AND PHARYNGEAL RESPIRATORY REFLEXES OF THE CAT

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Abstract
Mechanical stimulation of the pharyngeal palatine mu-cosa of the cat causes in most cases acceleration of respiration. In some instances an inhibitory response is also normally present. Application of cocaine to the pharyngeal palatine mucosa abolishes first the hyperpneac response, and then the inhibitory response. The palatine accelerator respiratory reflex is mediated by the greater superficial petrosal branch of the nervus inter-medius. The palatine inhibitory reflex is mediated by the maxillary division of the trigeminal nerve. The pharyngeal accelerator respiratory reflex is mediated by the glossopharyngeal nerves. The pharyngeal inhibitory reflex is mediated by the pharyngeal branch of the vagus nerve, and sometimes by the superior laryngeal nerve also.

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