DUAL INNERVATION OF THE FOLIATE PAPILLAE OF THE RAT: AN ELECTROPHYSIOLOGICAL STUDY

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Abstract
The dual innervation of the foliate papillae of the rat by the chorda tympani and the glossopharyngeal nerves was determined in this electrophysiological study. The magnitude of the chorda tympani response to the chemical stimulation of the foliate papillae was small and variable in different animals. Summated responses of both the chorda tympani and the glossopharyngeal nerves to the stimulation of the foliate papillae showed similar patterns such as long latencies, slowly rising responses after onset of stimulation and slow declines by water ringing. The relative responsiveness to 5 different chemicals applied to the foliate papillae were almost the same for the chorda tympani and the glossopharyngeal nerves. However, these 2 nerves produced different patterns of response to various chemicals applied to the fungiform, foliate and circumvallate papillae.

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