Abstract
Parameters of IPSPs and characteristics of inhibitory neuromuscular transmission in the dactylopodite-opener muscle of the crayfish pincer at various rhythms of activity were studied by intracellular recording. The presynaptic conduction nature of high-frequency (pessimal) blockade of the inhibitory system was demonstrated. Transformation of the rhythm of stimulation correlated with a decrease in conduction velocity along the inhibitory axon and (or) its branches. At high frequencies of stimulation the mean quantum composition of IPSPs of the potentiation plateau before the beginning of rhythm transformation was lower than at lower frequencies. No signs of exhaustion of mediator reserves were found in the course of high-frequency activity. It is concluded that the mechanism of secretion of inhibitory mediator is more reliable than the function of conduction of the presynaptic nervous impulse. The possible functional significance of the comparatively low reliability of function of crustacean nerve fibers is discussed.
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T. M. Drabkina, “Electrophysiological characteristics and assessment of quantum output of neuromuscular transmission in the crayfish pincer at rest and during low-frequency activity,” Vestn. Leningrad. Gos. Univ., No. 9, 65 (1973).
T. M. Drabkina, “Evaluation of statistical parameters of quantum release of mediator in the neuromotor synapse of the crayfish,” in: Biology and Scientific and Technical Progress. Abstracts of Proceedings of an All-Union Conference of Junion Scientists [in Russian], Pushchino (1974), pp. 240–243.
T. M. Drabkina, “Electrophysiological characteristics of excitatory and inhibitory synapses of the opener muscle of the crayfish pincer under different conditions of activity,” Author's Abstract of Dissertation, Leningrad (1977).
T. M. Drabkina, “Nature of the high-frequency (Wedensky) block in excitatory neuromuscular synapses of the crayfish,” Fiziol. Zh. SSSR,63, 1426 (1977).
M. A. Kamenskaya, “Physiological analysis of the process of mediator secretion from nerve endings of skeletal muscles of animals and man,” Author's Abstract of Dissertation, Moscow (1976).
D. P. Matyushkin and T. M. Drabkina, “Assessment of the quantum composition of excitatory postsynaptic potentials in neuromuscular synapses of complex type,” Fiziol. Zh. SSSR,59, 541 (1973).
T. A. Stepushkina, G. S. Kan, and V. N. Kosolapov, “Characteristics of activity of efferent neurons during reflex opening of the dactylopodite of the crayfish pincer,” Fiziol. Zh. SSSR,56, 179 (1970).
H. L. Atwood, “Crustacean neuromuscular mechanisms,” Amer. Zool.,7, 527 (1967).
H. L. Atwood and W. A. Morin, “Neuromuscular and axo-axonal synapses of the crayfish opener muscle,” J. Ultrastruct. Res.,32, 351 (1970).
W. Burke and B. L. Ginsborg, “The electrical properties of the slow muscle fibre membrane,” J. Physiol. (London),132, 586 (1956).
D. Elmqvist and D. M. J. Quastel, “A quantitative study of end-plate potentials in isolated human muscles,” J. Physiol. (London),178, 505 (1965).
J. Grossman, M. E. Spira, and I. Parnas, “Differential flow of information into branches of a single axon,” Brain Res.,64, 379 (1973).
H. Grundfest, J. P. Reuben, and E. Rickles, “The electrophysiology and pharmacology of lobster neuromuscular synapses,” J. Gen. Physiol.,42, 1301 (1959).
H. Hatt and D. O. Smith, “Axon conduction block: differential channeling of nerve impulses in the crayfish,” Brain Res.,87, 85 (1975).
A. R. Martin, “Quantal nature of synaptic transmission,” Physiol. Rev.,46, 51 (1966).
I. Parnas, “Differential block at high frequency of branches of a single axon innervating two muscles,” J. Neurophysiol.,35, 903 (1972).
A. Takeuchi and N. Takeuchi, “Localized action of gamma-aminobutyric acid on the crayfish muscle,” J. Physiol. (London),177, 225 (1965).
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Translated from Fiziologicheskii Zhurnal SSSR imeni I. M. Sechenova, Vol. 63, No. 11, pp. 1535–1540, November, 1977.
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Drabkina, T.M. Electrophysiological characteristics of crayfish inhibitory neuromuscular synapses at different rhythms of activity. Neurosci Behav Physiol 10, 317–322 (1980). https://doi.org/10.1007/BF01184043
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DOI: https://doi.org/10.1007/BF01184043