Neuronal Pathways from the Tectal "Snapping-Evoking Area" to the Tongue-Muscle-Controlling Motoneurons in the Japanese Toad : Evidence of the Intervention of Excitatory Interneurons(COMMUNICATION)(Physiology)

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概要

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• Using intracellular recording techniques in paralyzed Japanese toads, tongue-musclecontrolling motoneurons were identified antidromically and neuronal pathways from the tectal "snappingevoking area" (the ventrolateral part of the optic tectum) to these motoneurons were searched. The tongue-muscle-controlling motoneurons generally showed hyperpolarizing potentials in response to a single electrical stimulus applied to either side of the "snapping-evoking area." On the other hand, large and long-lasting excitatory postsynaptic potentials (EPSPs) which prevailed over the hyperpolarizing potentials were evoked in response to repeated electrical stimuli at short intervals, i.e., a temporal facilita tion of EPSPs was observed. In some motoneurons tested, these EPSPs were further spatially facilitated; i.e., the EPSPs were facilitated when electrical stimuli were applied bilaterally to the "snapping-evoking area". These results strongly suggest (1) that excitatory interneurons intervene in the tecto-bulbar pathways from the "snapping-evoking area" to the tongue-muscle-controlling motoneurons, (2) that the bilateral descending volleys from this area converge on these interneurons, and (3) that temporal and spatial facilitation of spike discharges occurs in these interneurons. From these results, it is proposed that temporal and spatial integration of synaptic inputs in premotor interneurons plays an important role in motor-pattern generation for prey-catching.

• 社団法人日本動物学会の論文

著者

• Satou Masahiko

  Zoological Institute Faculty Of Science University Of Tokyo

• UEDA KAZUO

  Zoological Institute, Faculty of Science, University of Tokyo

• MATSUSHIMA TOSHIYA

  Zoological Institute, Faculty of Science, University of Tokyo

• Matsushima Toshiya

  Zoological Institute Faculty Of Science University Of Tokyo

• Ueda Kazuo

  Zoological Institute Faculty Of Science Tokyo University

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