Visible Light Reception of Accessory Eye in the Giant Snail, Achatina fulica, as Revealed by an Electrophysiological Study : Physiology
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Extracellular and intracellular recordings were made in the accessory eye of the giant snail, Achatina fulica, in order to compare its photoreceptoral function with that of the main eye. Four types of ERGs were recorded through the suction electrode positioned at various locations in eye preparations. Recordings of the ERG mainly attributable to the accessory eye were accomplished by making fissure on the cornea. Intracellularly two types of receptor potentials with spiking and without spiking were recorded in the accessory and main eyes. With the HRP technique, it became apparent that the receptor potentials without spikes were evoked by photosensory cells type I in both eyes. Spectral sensitivity curve for the accessory and main eyes constructed with the criterion responses of ERGs and receptor potentials were similar. Both have a peak near 480nm, and are not responsive to light having a wavelength greater than 750nm. These results, in combination with morphological data, lead me to conclude that the Achatina accessory eye may serve as a monitor of surrounding light intensity in a visible range.
- 社団法人日本動物学会の論文
- 1989-10-15
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