SYNAPTIC POTENTIAL IN THE MOTOR GIANT AXON OF THE CRAYFISH
Open Access
- 20 July 1958
- journal article
- research article
- Published by Rockefeller University Press in The Journal of general physiology
- Vol. 41 (6), 1119-1128
- https://doi.org/10.1085/jgp.41.6.1119
Abstract
Some electrical properties of the synapses between central giant axons (presynaptic) and the motor giant axon (postsynaptic) of the crayfish abdominal nerve cord have been investigated. Postsynaptic potential change in response to presynaptic volleys contains two components: a spike potential and a synaptic potential of very long time course. Amplitude of the synaptic potential is graded according to the number of active presynaptic axons. Conductance increase in the synaptic membrane endures over most of the period of potential change, and it is this rather than the "electrical time constant" of the membrane that in large measure determines the form of the synaptic potential. Temporal summation of synaptic potential occurs during repetitive presynaptic stimulation, and after such stimulation the rate of decay of synaptic potential is greatly slowed.Keywords
This publication has 4 references indexed in Scilit:
- Stimulation of spinal motoneurones with intracellular electrodesThe Journal of Physiology, 1956
- Excitatory synaptic action in motoneuronesThe Journal of Physiology, 1955
- Biophysics of Junctional TransmissionPhysiological Reviews, 1954
- An analysis of the end‐plate potential recorded with an intra‐cellular electrodeThe Journal of Physiology, 1951