The origin of slow potentials on the tongue surface induced by frog glossopharyngeal efferent fiber stimulation.
The origin of slow potentials on the tongue surface induced by frog glossopharyngeal efferent fiber stimulation.
复制标题
青蛙舌咽传出纤维刺激引起的舌面慢电位的起源。
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
R. Fujiyama
中科院分区：
文献类型：
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作者：
T. Sato;K. Toda;T. Miyamoto;Y. Okada;R. Fujiyama
电刺激蛙的舌咽神经时，从舌面记录到正电性慢电位，从菌状乳头的味觉细胞记录到去极化慢电位。慢电位的幅值具有刺激强度和频率依赖性。慢电位的产生与GP神经中有髓传入纤维的逆向活动无关，但与GP神经中自主神经节后C纤维的逆向活动有关。静脉注射阿托品可使刺激GP神经诱发的正性和去极化慢电位消失，提示慢电位是由副交感节后纤维的活动诱发的。慢电位的幅度和极性取决于施加到舌表面的适应性氯化钠溶液的浓度。这些结果表明，从舌表面和味觉细胞记录的慢电位是由于GP神经刺激舌腺分泌的唾液和舌表面的适应溶液之间产生的液体连接电位。
When the glossopharyngeal (GP) nerve of the frog was stimulated electrically, electropositive slow potentials were recorded from the tongue surface and depolarizing slow potentials from taste cells in the fungiform papillae. The amplitude of the slow potentials was stimulus strength- and the frequency-dependent. Generation of the slow potentials was not related to antidromic activity of myelinated afferent fibers in the GP nerve, but to orthodromic activity of autonomic post-ganglionic C fibers in the GP nerve. Intravenous injection of atropine abolished the positive and depolarizing slow potentials evoked by GP nerve stimulation, suggesting that the slow potentials were induced by the activity of parasympathetic post-ganglionic fibers. The amplitude and polarity of the slow potentials depended on the concentration of adapting NaCl solutions applied to the tongue surface. These results suggest that the slow potentials recorded from the tongue surface and taste cells are due to the liquid junction potential generated between saliva secreted from the lingual glands by GP nerve stimulation and the adapting solution on the tongue surface.