フナの洗滌運動に伴う中枢ニューロンの活動について

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By means of a silver microelectrode inserted into the medulla of the crucian carp, neuronal activities concerned with the cleaning motion of the operculum were investigated. Neurons which became active only at the time of the cleaning motion and remained quiescent during normal breathing were found (Fig. 1). Three types were classified according to the phase relationship between their activities and the onset of the abduction phase of the cleaning motion as represented by an abrupt cessation of activity in the motor nerve innervating the m. adductor mandibulae (Fig. 2). Among them, type CM-1 neurons, which became active prior to the onset of the cleaning motion seem to be pure cleaning motion initiators and they were densely located at the level of the rostral facial lobe (Fig. 3). The neurons of the other two types, CM-2 and CM-3, appear to belong to the reserved respiratory neurons, since they occasionally showed spike discharges in accordance with the respiratory cycle (Fig. 8). All the respiratory neurons which showed periodic activities keeping pace with the normal breathing, modified their firing at the moment of the cleaning motion. All of the expiratory neurons stopped firing during the abduction phase of the cleaning motion (Fig. 4), and the majority of the inspiratory neurons initiated a burst of firing at that phase (Fig. 5). Among the phase-spanning neurons, more than half of the expiratory-inspiratory neurons ceased firing during the abduction phase, though in a minority of them, a small burst of spikes was still recognizable (Fig. 6A and B). All of the inspiratory-expiratory neurons discharged a burst of spikes at the late phase of the abduction of the cleaning motion (Fig. 6C and D). Neuronal plants for the initiation of the cleaning motion are discussed.
社団法人日本動物学会の論文
1978-06-25

フナの洗滌運動に伴う中枢ニューロンの活動について

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