イモリ下顎皮膚面の化学的刺激に対する応答

概要

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Responses of the facial nerve in the newt (Cynops pyrrhogaster) to stimulation of the skin of the lower jaw by various chemical solutions were recorded using an integrator. Of the conventional four taste stimuli NaCl, HCl and quinine hydrochloride caused marked responses, but sucrose did not produced any responses even at 1M concentration. Approximate thresholds were 0.01mM for HCl and 0.1mM for NaCl and quinine hydrochloride. KCl was similar to NaCl in the threshold and in rate of increase in the magnitude of response with increasing concentration. However, the magnitude of response to NaCl was slightly greater than that to KCl above 0.1M. The order of the stimulating effectiveness of 0.1M monovalent salts was NH_4Cl≧NaCl≧LiCl≧KCl≧RbCl>CsCl and that of 0.03M divalent salts was BaCl_2>MgCl_2>CaCl_2≧SrCl_2. Thresholds for divalent salts were rather low compared to NaCl and the responses indicated a tendency to either saturate or decline at concentrations above 0.03M. Temporal patterns of responses to divalent salts were fairly different from responses to monovalent salts. On the skin of the lower jaw, many lateral-line organs were histologically observed, but no taste bud-like structures were detected.
社団法人日本動物学会の論文
1978-03-25