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Figure 6. Example of discharges recorded from fibers of the two primary sensory nerves that innervate the pharynx and larynx. (A) The distribution of sensory afferent fibers for the glossopharyngeal nerve (IX) and the superior laryngeal nerve (SLN), which is a branch of the vagal nerve (X). (B) The sensory fibers for both the glossopharyngeal and superior laryngeal nerves synapse in the nucleus tractus solitarius (NTS). (C) Different discharge patterns of sensory fibers from the superior laryngeal nerve recorded from laboratory animals during the inducement of particular reflexes (e.g., apnea, cough) (adapted with permission from Storey [1968b]). (D) Different patterns of electrical stimulation applied to the superior laryngeal nerve of laboratory animals to induce pharyngeal swallowing (adapted with permission from Doty [1951]).
