Figure 5 - Sensory nerve supply of the mucous membrane of the oral cavity and pharynx.
From the following article
Physiology of oral cavity, pharynx and upper esophageal sphincter
Benson T. Massey
GI Motility online (2006)
doi:10.1038/gimo2
Sensory receptors that initiate swallow reflex are present only in post part of the oral cavity and upper portion of pharynx. The afferents are carried in glossopharyngeal (IX) and vagus (X) nerves. (Source: Netter medical illustration with permission of Elsevier. All rights reserved.)
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