Physiological characterization of lip and tentacle nerves in Lymnaea stagnalis
Physiological characterization of lip and tentacle nerves in Lymnaea stagnalis
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春鳗唇神经和触角神经的生理特征
DOI：
10.1016/s0168-0102(99)00020-6
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发表时间：
1999-04-01
影响因子：
2.9
通讯作者：
Ito, E
中科院分区：
文献类型：
--
作者：
Nakamura, H;Kojima, S;Ito, E
使用电生理技术对池塘蜗牛（Lymnaea stagnalis）的唇部和触手神经进行了表征。当在唇触手制剂中诱导这些神经的活动时，厌恶味觉信号通过所有唇神经和触手神经传递，但食欲信号只能通过上唇神经记录。在浸入高 Mg2+-高 Ca2+ 盐水中的 CNS 中，对任何神经施加电刺激均未能在参与进食反应的调节神经元（脑巨细胞：CCC）中诱导动作电位，这意味着信号通过多突触传递至 CGC。细胞内记录显示，半完整半身制剂中的 CGC 不仅通过上唇神经而且还通过中唇神经接收食欲和厌恶味觉信号。此外，osphradiium 被排除在食欲接收的候选者之外。目前的结果，加上我们之前通过组织化学分析获得的数据，表明负责产生进食反应的食欲味觉转导是通过上唇神经进行的，其中正中唇神经也有一定贡献。数据表明，CGC 可以接收各种味觉信号，这表明它可能在进食行为中发挥着至关重要的作用，正如条件性味觉厌恶研究所证明的那样。 (C) 1999 Elsevier Science Ireland Ltd. 保留所有权利。
The lip and tentacle nerves of the pond snail, Lymnaea stagnalis, were characterized using electrophysiological techniques. When the activity of those nerves was induced in lip-tentacle preparations, aversive taste signals were transmitted through all the lip and tentacle nerves, but appetitive signals could be recorded only through the superior lip nerve. In the CNS immersed in high Mg2+-high Ca2+ saline, electrical stimuli applied to any of the nerves failed to induce action potentials in one of the regulatory neurons (cerebral giant cell: CCC) involved in feeding responses, implying that the signals are polysynaptically transmitted to the CGC. Intracellular recordings revealed that the CGCs in semi-intact half-body preparations received both appetitive and aversive taste signals not only through the superior lip nerve but also through the median lip nerve. In addition, an osphradium was ruled out as a candidate for appetitive reception. The present results, together with our preceding data arrived at by the histochemical analyses, indicate that the appetitive taste transduction responsible for generating feeding responses is performed through the superior lip nerve with some contribution of the median lip nerve. The data showing that the CGC can receive various taste signals suggests that it may play a crucial role in feeding behavior as demonstrated in the study of conditioned taste-aversion. (C) 1999 Elsevier Science Ireland Ltd. All rights reserved.