ザリガニ平衡感受器の電気的反応と神経中枢における伝達

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The discharge patterns of the statocyst in response to different mechanical stimuli and the descending impulses transmitted through the supra-oesophageal ganglion were observed in the afferent nerves and the circum-oesophageal commissures of he crayfish, Procambarus clarkii, by an external recording method. Body inclination of the animal caused change in the frequency of the spontaneous discharges. The non-adapting responses of the statolith hair receptors were obtained by the applications of sound and vibration stimuli, the frequencies of which were lower than 200 c.p.s. Changing intensity of the vibration usually altered the synchrony of the afferent discharges. These results suggest the 'bellshaped response type' by the deflection of the each hair receptor. Other receptors, which may be a group of the statolith-free hairs, responded to horizontal rotation. The bursts of impulses seemed to be evoked mainly at the start of contralateral rotation and also at the end of ipsilateral ones. But the discharge ceased rapidly during increase or decrease in angular acceleration. No specific response was evoked in the afferent nerves by pitching or rolling stimulation. On the other hand, by horizontal and vertical rotations, large spikes of impulses were recorded in descending axons of both circumoesophageal commissures. They were classified in two groups from their amplitudes. By application of high intensity sound stimuli to unilaterally statocyst-ectomyzed preparations, it was found that each sensory nerve makes synapses with the ipsilateral and the contralateral descending axons respectively. The synaptic delay at the supra-oesophageal ganglion was about 26 msec and it suggested the presence of complicated synaptic junctions. Postganglionic responses seemed to be inhibited remarkably by repetitive afferent volleys evoked by sound and vibration stimuli.
社団法人日本動物学会の論文
1965-10-15

ザリガニ平衡感受器の電気的反応と神経中枢における伝達

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