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

1973; Rockefeller University Press; Volume: 62; Issue: 2 Linguagem: Inglês

10.1085/jgp.62.2.224

1540-7748

Hans Rudolf Brenner, W. Rathmayer,

Plant and Biological Electrophysiology Studies

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.