The Journal of General Physiology
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The Journal of General Physiology, Vol 62, 224-236, Copyright © 1973 by The Rockefeller University Press

ARTICLE

The Quantal Nature of Synaptic Transmission at the Neuromuscular Junction of a Spider

H. R. Brenner 1 and W. Rathmayer 1

1 From the Fachbereich Biologic der Universität Konstanz, Konstanz, West Germany

Spontaneous and evoked release of transmitter at neuromuscular junctions in three different leg muscles of a tarantula (Dugesiella hentzi) was investigated. In most cases the spontaneous miniature potentials were released independently, although bursts from single synaptic junctions occasionally occurred. In contrast to recent findings in other arthropod muscles, focal extracellular recording from junctional areas revealed that the evoked release of transmitter quanta followed Poisson's theorem at low quantal content synaptic junctions in arachnid muscles.

Submitted on April 4, 1973


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