The labeled lines theory of taste coding holds that each taste nerve fiber carries a particular taste quality.
The sensory system that contributes to the perception of flavor is the gustatory system or sense of taste. A substance in the mouth combines chemically with taste receptor cells on taste buds in the oral cavity, primarily on the tongue, to generate or stimulate the impression of taste.
The vagus nerve (cranial nerve X), which supplies fibers to the epiglottis region, the glossopharyngeal nerve (cranial nerve IX), which supplies fibers to the posterior third of the tongue, and the facial nerve (cranial nerve VII), which supplies fibers to the anterior two-thirds of the tongue, are the three nerves connected to taste. The category of taste nerve fiber is a unique visceral afferent (SVA).
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