The function of photoexcitive neurones in the central ganglia for behavioral activity of the marine mollusc,Onchidium verruculatum
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The function of the photoexcitive neurones located within the CNS in the marine pulmonate mollusc,Onchidium verruculatum was investigated.
A light-evoked discharge was recorded from the photoexcitive neurones in the whole animal preparation (Fig. 3).
Tactile stimuli from the mantle were mediated synaptically to the photoexcitive neurones through the pleuro-parietal nerves of both sides (Fig. 4).
An attempt was made to confirm the tactile receptive field of the photoexcitive neurones, Ep-2, Bp-3 and Es-1 by stimulating the mantle surface of the animal with brush strokes (Fig. 5).
It was suggested that sensory inputs which inhibited the photoexcitive neurones were derived from some mechanoreceptors other than tactile receptors within the mantle (Fig. 6).
A stereotyped response (the mantle-levating reflex) was evoked by tactile stimuli given to the mantle surface. This response could also be elicited by direct electrical stimulation of the photoexcitive neurones (Fig. 8).
The photoexcitive neurones played a role in regulating the transmission of the tactile sensory information (Fig. 9).
From these results, it was postulated that the photoexcitive neurones modified the activity level of the mantle-levating reflex.
KeywordsElectrical Stimulation Receptive Field Sensory Input Sensory Information Behavioral Activity
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- Araki, T., Otani, T.: Response of single motoneurones to direct stimulation in toad's spinal cord. J. Neurophysiol.18, 472–485 (1955).Google Scholar
- Arvanitaki, A., Chalazonitis, N.: Excitatory and inhibitory processes initiated by light and infra-red radiations in single identifiable nerve cells (giant ganglion cells ofAplysia). In: Florey, E. (ed.), Nervous inhibition, p. 194–231. London: Pergamon Press 1961.Google Scholar
- Gotow, T., Tateda, H., Kuwabara, M.: Physiological role of photoexcitive neurones in the central ganglia ofOnchidium verruculatum. Zool. Mag. (Japan)81, 232–233 (1972).Google Scholar
- Hisano, N., Tateda, H., Kuwabara, M.: Photosensitive neurons in the marine pulmonate mollusc,Onchidium verruculatum. J. exp. Biol.57, 651–660 (1972a).Google Scholar
- Hisano, N., Tateda, H., Kuwabara, M.: An electrophysiological study of the photoexcitive neuronsin situ ofOnchidium verruculatum. J. exp. Biol.,57, 661–671 (1972b).Google Scholar
- Hughes, G. M., Taue, L.: A direct synaptic connexion between the left and right giant cells inAplysia. J. Physiol. (Lond.)197, 511–527 (1968).Google Scholar
- Kennedy, D.: Neural photosensitivity inMactra. Biol. Bull.115, 338 (1958).Google Scholar
- Kennedy, D.: Physiology of photoreceptor neurons in the abdominal nerve cord of the crayfish. J. gen. Physiol.46, 551–572 (1963).Google Scholar
- Mauro, A., Baumann, F.: Electrophysiological evidence of photoreceptors in the epistellar body ofEledone moschata. Nature (Lond.)220, 1332–1334 (1968).Google Scholar
- Prosser, C. L.: Responses to illumination of the eye and caudal ganglion. J. cell. comp. Physiol.4, 363–378 (1934).Google Scholar
- Yoshida, M., Millott, N.: Light sensitive nerve in an echinoid. Experientia (Basel)15, 13–14 (1959).Google Scholar