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By Graham Hoyle (auth.), Graham Hoyle (eds.)

Identified Neurons and behaviour of Arthropods provides for the bigger viewers the papers brought at a symposium of an analogous identify. I equipped this symposium in order that many of the many that owe him a superb clinical debt may well honor Professor C. A. G. (Kees) Wiersma upon his reaching the age of 70 and retiring from the California Institute of know-how. every body of the contributors publicly said his debt to Kees Wiersma, yet in a feeling there has been no use to take action, as the study pronounced spoke for itself. Seldom in a swiftly constructing department of modem technological know-how has the entire fresh growth so in actual fact stemmed from the pioneering paintings of a unmarried determine. yet during this topic, the position of pointed out nerve cells in deciding upon habit, Wiersma stood almost by myself for 30 years. He it used to be who first confirmed that indi­ vidual nerve cells are recognizable and functionally vital and feature "per­ sonalities" in their own.

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5. Effects of SI and CI axons at single excitatory synapses of the same muscle fiber (A,B) and on facilitation of the epsp (C) in the crab Hyas (Wiens and Atwood, 1975). In A and B, records of epsp's are accompanied by records of externally recorded synaptic potentials (ersp's) at single synaptic sites. Optimally timed SI stimulation is more effective in reducing epsp amplitude than optimally timed CI stimulation in both A and B. In A, SI stimulation also reduces the ersp more than CI stimulation, but in B, Cl's effect on the ersp's is stronger than Sl's effect.

Representative electrical records of epsp's in crayfish opener (E), stomach muscle (F), and Pachygrapsus "fast" extensor axon (G) are also given to provide a physiological correlate for synaptic morphology. uncertain. Some possibilities, including differences in rates of transmitter mobilization and in depolarization-secretion coupling, have been rejected as unlikely by Bittner (l968a). Another suggestion, differential invasion of different terminals by the nerve impulse (Atwood, 1967a; Bittner, 1968a; Sherman and Atwood, 1972), was based on observations of Dudel and Kuffler (1961a,b,c), who reported that synaptic terminals in crayfish could not be excited by direct stimulation.

Responses showed desensitization at a rate typical of junctional receptors in control fibers. (b) Fiber exposed to 10-6 M concanavalin A for I hr. Responses now exhibited simultaneous potentiation and summation to I nC glutamate pulses delivered at the same frequency as in (a). Note high frequency of spontaneous mepsp's. (c) A prolonged train of 3 nC pulses delivered at intervals of 240 msec evoked a train of D-responses on the extrajunctional membrane. These depolarizations initially showed simultaneous potentiation and summation, leading to the formation of a stable, summated depolarization which decayed rapidly on cessation of glutamate ejection.

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