Electrical responses of <Emphasis Type="Italic">Lymnaea stagnalis</Emphasis> to light stimulation: Effect of divalent cations |
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Authors: | V V Zhukov A D Fedorenko A I Lavrova E B Postnikov |
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Institution: | 1.Immanuel Kant Baltic Federal University,Kaliningrad,Russia;2.Kursk State University,Kursk,Russia |
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Abstract: | The effects of Ca2+, Mg2+ and Mn2+ on light-evoked electrical responses, ERG and action potentials of optic nerve fibers, were studied in an isolated eye of Lymnaea stagnalis. Signals of both types persisted with minor changes when Mg2+ concentration in the bath solution was increased up to 15 mM. This finding suggests that action potentials of photoreceptor cells are transmitted via their axons directly to central ganglia without a relay in chemical synapses on interneurons. At the same time, the changed spiking pattern may indicate chemical interactions between photoreceptors cells themselves. In the presence of 4 mM EDTA or 10 mM Mn2+, both ERG waves and spiking activity were considerably depressed, probably, as a result of impaired phototransduction in photoreceptor cells. |
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