メクラウナギの痕跡眼に見られる活動電位

概要

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Action potentials were obtained by light stimulus to the eye buried beneath the skin in the hag fish, Myxine garmani. The potential was a slow positive monophasic deflection and the maximum of the potential was about 0.1 mV. Theamplitude of the potential augmented with the increase in stimulus intensity, but the pote tialn attained a maximum at the unexpectedly low light stimulus intensity of 1 lux. The potential did not elicit an off-effect and also did not respond to the usual flicker stimuli. A long refractory period of the potential was found in the experiments using slowly repetitive stimuli. The properties of these potentials were found to be similar to those of the ERG obtained from benthonic fish, particularly in Batoidei. Althogh the potential is considerably suppressed with light adaptation, the eye recovered its sensitivity rapidly in darkness, and the recovery of the sensitivity showed a simple course. The spectral sensitivity curve investigated in the dark-adapted state showed the maximum at 500 mμ, and the maximum was not shifted by light adaptation. This fact suggests that the eye has only one type of visual pigment. Histological studies of the hagfish eye failed to show any affinities to the pineal organ which is photoreceptive. Moreover, the hagfish eye has a retinal like layer, which is believed to generate the observed action potentials.
社団法人日本動物学会の論文
1963-01-15