Summary
Lateral and medial branch of the frog's IXth nerve innervates rostral third and caudal two-thirds of the tongue surface, respectively. The amounts of gustatory signals in these branches differ in proportion to the area they supply.
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Ishiko, N., Hanamori, T. & Murayama, N. Frog's tongue receptive areas: Neural organization and gustatory function. Experientia 35, 773–774 (1979). https://doi.org/10.1007/BF01968239
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DOI: https://doi.org/10.1007/BF01968239