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Related Experiment Videos

Early facilitation at corticomotoneuronal synapses.

R Porter

    The Journal of Physiology
    |May 1, 1970
    PubMed
    Summary
    This summary is machine-generated.

    This study investigated corticomotoneuronal excitatory postsynaptic potentials (EPSPs) in monkeys. Findings reveal that paired corticospinal volleys enhance motoneuronal activity, peaking at 2ms and lasting up to 10ms.

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    Area of Science:

    • Neuroscience
    • Motor Control
    • Computational Neuroscience

    Background:

    • Corticomotoneuronal pathways are crucial for voluntary movement.
    • Understanding synaptic plasticity in these pathways is key to motor control.
    • Previous research has explored synaptic responses but lacked detailed temporal facilitation analysis.

    Purpose of the Study:

    • To quantify the temporal dynamics of synaptic facilitation in corticomotoneuronal excitatory postsynaptic potentials (EPSPs).
    • To determine the relationship between the interval of paired corticospinal volleys and the degree of EPSP facilitation.
    • To assess the physiological relevance of this facilitation for motoneuronal discharge at natural firing frequencies.

    Main Methods:

    • Generation of corticomotoneuronal EPSPs in lumbar motoneurones of monkeys using single and paired corticospinal volleys.

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  • Measurement of the facilitation of the second EPSP relative to the first.
  • Analysis of the time course of facilitation across varying inter-volley intervals.

    • Main Results:

    • EPSP facilitation was maximal approximately 2 milliseconds after the initial volley.
    • Facilitation decayed exponentially with a time constant of about 10 milliseconds.
    • Significant facilitation persisted for up to 10 milliseconds, suggesting a role in motoneuronal firing.

    Conclusions:

    • Paired corticospinal volleys induce significant, time-dependent facilitation of corticomotoneuronal EPSPs.
    • This synaptic facilitation phenomenon can contribute to motoneuronal recruitment and discharge during natural corticospinal activity.
    • The findings provide insights into the temporal summation mechanisms underlying motor control.