An electrophysiological study of the photo-excitative neurones of Onchidium verruculatum in situ.
نویسندگان
چکیده
The giant neurones and relatively long nerves or connectives of the mollusca have been used extensively in electrophysiological studies, but little work has been done on the physiological behaviour of neurones in situ. Hughes & Tauc (1962) have reported investigation on giant cells of Aplysia in the whole animal as well as in isolated ganglion preparations. Recently, the gill-withdrawal reflex in Aplysia was studied by Pinsker et al. (1969), by Kupfermann et al. (1970), and by Castellucci et al. (1970), and. the swimming behaviour in Tritonia by Willows (1967) and by Dorsett, Willows & Hoyle (1969). They studied the influence of peripheral mechanical stimulation on the giant cells but did not analyse the effect of light on whole-animal preparations. It has been reported that Onchidium has many neurones as large as those of Aplysia (Hagiwara & Saito, 1959) and some of them are photo-excitative in the isolated ganglion preparation (Hisano, Tateda & Kuwabara, 1972). Onchidium is suitable for studying the neuronal pathway in whole-animal preparations because the body size is adequate and many neurones are easily identified due to their large size and pigment. This paper is concerned particularly with the electrophysiological character of these photo-excitative neurones in situ. It was found that in situ, impulses from all photo-excitative neurones elicited by light were suppressed, and that only the 'off' spikes originated in these neurones by the stimulation to the stalk and dorsal eyes.
منابع مشابه
Photosensitive neurones in the marine pulmonate mollusc Onchidium verruculatum.
It has been amply demonstrated that the nerve cells of some animals respond to light, and that excitatory and inhibitory cells are involved in this response (Arvanitaki & Chalazonitis, 1949a, b, 1958; Kennedy, 1961, 1963; Yoshida & Millott, 1959). In the photo-excitative cell, depolarization of the membrane, appearance of spikes or increase of their frequency have been seen in response to light...
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عنوان ژورنال:
- The Journal of experimental biology
دوره 57 3 شماره
صفحات -
تاریخ انتشار 1972