The relation between the receptive and emissive functions of the larynx on the one hand and respiration and vocalization on the other are generally considered to be reflex. This point of view can be supported by considerable anatomic and physiologic data. The tenth cranial nerve, for example, which, as is well known, is closely connected with the parasympathetic nervous system, innervates both the larynx and the lungs. Irritation of regions supplied by the inner branch of the superior laryngeal nerve causes coughing. Coughing may be produced by stimulation both of the inner branch of the superior laryngeal nerve and of the branches of the vagus nerve in the trachea, in the lung tissues and in the pleura. It is well known that dangerous consequences may result from irritation of or injury to the recurrent nerve. Respiration may be partially or completely impeded. In cases of paralysis in the abduction position,
FROESCHELS E. PSYCHOLOGY OF THE LARYNGEAL FUNCTIONS. Arch Otolaryngol. 1940;32(6):1039–1044. doi:https://doi.org/10.1001/archotol.1940.00660021047004
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