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Motoneuron dendrites: role in synaptic integration.

J N Barrett

    Federation Proceedings
    |April 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Dendrites have high membrane resistance, allowing distant synapses to influence neuron firing. However, synaptic activity significantly alters this resistance, affecting synapse effectiveness.

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    Area of Science:

    • Neuroscience
    • Computational Neuroscience

    Background:

    • Dendrites comprise over 80% of cat motoneuron receptive surface area.
    • Understanding dendritic function is crucial for comprehending neuronal integration.

    Purpose of the Study:

    • To investigate the specific resistance of dendritic membranes in cat motoneurons.
    • To determine how synaptic activity influences dendritic membrane resistance and synapse effectiveness.

    Main Methods:

    • Electrical and geometrical measurements in cat motoneurons.
    • Calculations of specific membrane resistance.
    • Analysis of synaptic conductance changes.

    Main Results:

    • Specific resistance of resting dendritic membranes is at least 2,000 ohm-cm².

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  • High dendritic membrane resistance allows distal synapses to impact soma depolarization.
  • Excitatory and inhibitory synaptic activity significantly reduce dendritic membrane resistance and synapse effectiveness.

    • Conclusions:

    • Dendritic membrane resistance is a dynamic property influenced by synaptic activity.
    • The effectiveness of dendritic synapses is modulated by the type, distribution, and intensity of background synaptic input.
    • Dendritic geometry and resting membrane properties also play a role in synapse effectiveness.