Investigation of the mechanism of temperature sensitivity of the electroreceptors of ampullae of lorenzini

Autor: G. R. Broun, G. G. Zhadan, V. I. Govardovskii
Rok vydání: 1980
Předmět:
Zdroj: Neurophysiology. 12:54-59
ISSN: 1573-9007
0090-2977
DOI: 10.1007/bf01065270
Popis: In experiments on Black Sea skates (Raja clavata), the potential of the receptor epithelium of the ampullae of Lorenzini and spike activity of single nerve fibers connected to them were investigated during electrical and temperature stimulation. Usually the potential within the canal was between 0 and −2 mV, and the input resistance of the ampulla 250–400 kΩ. Heating of the region of the receptor epithelium was accompanied by a negative wave of potential, an increase in input resistance, and inhibition of spike activity. With worsening of the animal's condition the transepithelial potential became positive (up to +10 mV) but the input resistance of the ampulla during stimulation with a positive current was nonlinear in some cases: a regenerative spike of positive polarity appeared in the channel. During heating, the spike response was sometimes reversed in sign. It is suggested that fluctuations of the transepithelial potential and spike responses to temperature stimulation reflect changes in the potential difference on the basal membrane of the receptor cells, which is described by a relationship of the Nernst's or Goldman's equation type.
Databáze: OpenAIRE
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