コイの中脳遊泳運動誘発域と誘起される魚体運動〔英文〕

概要

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The location of the midbrain locomotor region in the carp was investigated by using electrical micro-stimulation (2-10 μA, 50Hz) of the midbrain tegmentum. Swimming, evoked by micro-stimulation of a small area between the aquaeductus mesencephali and the fasciculus longitudinalis medialis, appeared very similar to swimming in intact carp. Stimulation of sites outside this region elicited only non-swimming movements of the tail, eyes, and fins. Electromyograms recorded simultaneously from the red and white trunk muscles showed that both muscles were active during swimming evoked even by the lowest threshold stimulation current and that the frequency and amplitude of bursts were correlated with stimulation intensity. We suggest that the region specified in the present study is involved in the initiation and control of swimming in the carp. The origin of projections to the spinal cord is assumed to be located in the nucleus fasciculus longitudinalis or the nucleus ruber.
日本水産學會の論文