By Graham Hoyle (auth.), Graham Hoyle (eds.)
Identified Neurons and behaviour of Arthropods provides for the bigger viewers the papers added at a symposium of an identical identify. I prepared this symposium in order that a number of the many that owe him an excellent medical debt may possibly honor Professor C. A. G. (Kees) Wiersma upon his achieving the age of 70 and retiring from the California Institute of know-how. every person of the members publicly said his debt to Kees Wiersma, yet in a feeling there has been little need to take action, as the study mentioned spoke for itself. Seldom in a quickly constructing department of modem technology has the entire contemporary 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 settling on habit, Wiersma stood almost by myself for 30 years. He it was once who first confirmed that indi vidual nerve cells are recognizable and functionally very important and feature "per sonalities" in their own.
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The unsheathed right-hand process shows the characteristic rippled membrane of a neurosecretory nerve ending; the other process is a motor axon and is in synaptic contact (arrows) with the muscle (M). G, Neurosecretory granules; H, hemolymph space; S, stroma; Sc, Schwann cell. Scale: IILm. From Osborne et al. (1971). Neuromuscular Transmission in Insects According to Scharrer (1968), the function of neurosecretory innervation of muscle tissue is probably to produce a more sustained and widespread stimulation than the normal type of activation by MNs.
5). Facilitatory effects in the excitatory nerve terminal also disappear; the epsp facilitates from its original "starting" amplitude when inhibition is relieved. This effect strongly suggests that electrical activity in excitatory nerve terminals that receive large inhibitory axon synapses is almost completely blocked by inhibition; effective blockade of this sort could be achieved most economically at branch points. Recently, we have found that some of the inhibitory nerve branches are specialized for presynaptic inhibition, while others are devoted to postsynaptic inhibition (Atwood and Kwan, 1976) (Fig.
It may influence a metabolic pump of the IRC generator. It would be of interest to determine whether the tonic fibers still respond to stimulation of the "slow" excitor (SETi) and inhibitor axons which innervate ETi once octoparnine treatment has terminated the spontaneous contractions, since it might then be possible to decide whether the site of action of octopamine is either junctional or extrajunctional. The effect of the pentapeptide proctolin (Brown, 1967) on IRC also deserves some attention.