アメリカザリガニ歩脚の神経支配について
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The slow fibre innervates the abductor muscle, and the fast and inhibitory axons innervate the abductor muscle of the walking legs of the crayfish. The inhibitory phenomena of contraction of the adductor and abductor muscles weve studied. The neuromuscular synapse of the fast fibre was activated by a single stimulus, but the synapse of the slow fibre was facilitated only by faradic stimulation. The slow contraction of the adductor muscle was remarkably inhibited by repetitive stimulation of the inhibitory axon. When the inhibitory axon was repetitively stimulated during the relaxation of the slow contraction, the relaxation was accelerated. The inhibitory effect remained for a while after the cessation of the stimulation of the inhibitory axon. Fast contraction evoked by repetitive stimulation of the fast axon in the adductor muscle was never inhibited by all means. The average rheobase of each of the three kinds of the axons was 1, 0.65 and 0.24 volts for the fast, slow and inhibitory axon, respectively. The average chronaxies were 0.65, 1.13 and 2.15 msec for the fast, slow and inhibitory axons, respectively. The average conduction velocities were 8, 4 and 5m/sec for the fast, slow and inhibitory axons, respectively. The inhibitory mechanism in the walking leg of the crayfish was discussed. The function of the neuromuscular system in the dactylopodite of the walking leg was found to be the same as that of the dactylopodite in the claw of the crayfish. Apparently the functional differentiation between the claw and walking leg has involved the neuromuscular system of the carpopodite and meropopodite only.
- 社団法人日本動物学会の論文
- 1964-01-15
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