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Integration and spike initiation in neuronal terminals.

L T Wang-Bennett, R M Glantz

    The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
    |June 1, 1986
    PubMed
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    Neuron terminals in crayfish brains act as independent integration sites, receiving sensory input. This dual function regulates synaptic transmission through both excitatory and inhibitory signals.

    Area of Science:

    • Neuroscience
    • Synaptic Plasticity
    • Crustacean Neurobiology

    Background:

    • Axoaxonal synapses are crucial for regulating synaptic transmission.
    • Neuron terminals are primary sites for synaptic integration.

    Purpose of the Study:

    • To investigate synaptic integration at neuron terminals in the crayfish brain.
    • To determine the role of axoaxonal synapses in regulating synaptic transmission.

    Main Methods:

    • Electrophysiological recordings from crayfish interneuron terminals.
    • Stimulation of primary afferent axons from antennae and statocysts.
    • Morphological analysis of synaptic profiles on presynaptic terminals.

    Main Results:

    • Crayfish interneuron terminals exhibit both excitatory postsynaptic potentials (EPSPs) and inhibitory postsynaptic potentials (IPSPs) upon sensory stimulation.

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  • EPSPs are monosynaptic and can trigger action potentials, with bidirectional conduction observed.
  • IPSPs are mediated by a polysynaptic pathway.
  • Two distinct morphological classes of synaptic profiles synapse onto presynaptic terminals.

    • Conclusions:

    • Neuron terminals in the crayfish brain function as independent sites for synaptic integration.
    • Axoaxonal synapses play a significant role in modulating synaptic transmission at the terminal level.
    • These findings contribute to understanding neural circuit regulation in invertebrates.