Special visceral afferent fibers (SVA) areafferent fibers that develop in association with thegastrointestinal tract.[1] They carry thespecial sense oftaste (gustation). Thecranial nerves containing SVA fibers are thefacial nerve (VII), theglossopharyngeal nerve (IX), and thevagus nerve (X).[2] The facial nerve receives taste from the anterior 2/3 of thetongue; the glossopharyngeal from the posterior 1/3, and the vagus nerve from the epiglottis.[3] The sensory processes, using their primary cell bodies from the inferior ganglion, send projections to the medulla, from which they travel in the tractus solitarius, later terminating at the rostral nucleus solitarius.[4]
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