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Journal of Experimental Biology 94,137-148 (1981)
Published by Company of Biologists 1981

Multiple Postsynaptic Actions of the Giant Dopamine-Containing Neurone R.Pe.D.I of Lymnaea Stagnalis

W. WINLOW ¹, P. G. HAYDON ², and P. R. BENJAMIN ³

¹ Department of Physiology, Worsley Medical and Dental Building, University of Leeds, Leeds LS2 9JT
² Department of Physiology, Worsley Medical and Dental Building, University of Leeds, Leeds LS2 9JT.; Emma and Leslie Reid Scholar.
³ Department of Physiology, Worsley Medical and Dental Building, University of Leeds, Leeds LS2 9JT.; Ethology and Neurophysiology Group, School of Biological Sciences, University of Sussex, Falmer, Brighton, Sussex BN1 9QG

(1) Evidence is presented that the giant neurone R.Pe.D.I is monosynaptically connected to follower cells in the right parietal and visceral ganglia and has excitatory, inhibitory and biphasic postsynaptic actions.

(2) The spike to e.p.s.p. latency is increased to a new fixed value by high calcium saline, but not by saline in which both the Ca^{2 +} and Mg²⁺ concentrations have been increased in proportion to one another.

(3) Three distinct classes of p.s.p. latency exist. Short e.p.s.p. and b.p.s.p. latencies of ca. 16.0 to 20 ms have been observed, as have longer e.p.s.p. and b.p.s.p. latencies, ca. 38-44 ms. An i.p.s.p. with a latency to onset of ca. 182 ms occurs on the J cells.

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