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J Neurophysiol 49: 1459-1468, 1983;
0022-3077/83 $5.00
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Journal of Neurophysiology, Vol 49, Issue 6 1459-1468, Copyright © 1983 by APS

ARTICLES

Synaptic interactions between mammalian central neurons in cell culture. III. Morphophysiological correlates of quantal synaptic transmission

E. A. Neale, P. G. Nelson, R. L. Macdonald, C. N. Christian and L. M. Bowers

The statistical properties of excitatory synaptic transmission between neurons in cell cultures of fetal mouse spinal cord were studied and the anatomical extent of these connections demonstrated by horseradish peroxidase (HRP) injection of the presynaptic cell. In conjunction with previous experiments (7), we have correlated the number of boutons involved in a given synaptic connection with the physiologically determined number of release elements. The number of boutons is somewhat greater than the number of release elements, and our results are supportive of the conclusion of others (1, 2) that the physiologically defined release element corresponds to the bouton. We interpret this to suggest that a rate-limiting mechanism may operate at the level of the bouton to allow release of no more than one quantal unit of transmitter with each presynaptic action potential.


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Quantitative Ultrastructural Analysis of Hippocampal Excitatory Synapses
J. Neurosci., August 1, 1997; 17(15): 5858 - 5867.
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