Electrical response of the lingual epithelium to stimulation of the gustatory nerve in frogs
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Electrical stimulation of the gustatory nerve is accompanied by the development of a positive electrical potential on the outer surface of the tongue (relative to its inner layers). The amplitude and steepness of rise of this potential increase whereas the latent period decreases with an increase in the frequency of stimulation. The response arises in the surface epithelial layer, 30–60 µ thick, and is expressed as a decrease in the steady "resting potential" (negativity outside) which exists on that layer. It is accompanied by a sharp decrease in the resistance of the surface layer of the tongue and it is probably the result of shunting of the epithelial layer by channels with high conductivity. A similar response, accompanied by a decrease in resistance of the surface layer of the tongue, also was recorded to adequate stimulation (application of a jet of acetic acid vapor). The results are compared with the response of the frog's skin to stimulation of a cutaneous nerve.
KeywordsAcetic Acid Surface Layer Electrical Stimulation Latent Period Electrical Potential
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