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Related Experiment Videos

Selective synaptic changes following spinal motoneuron axotomy

P B Farel

    Brain Research
    |May 5, 1980
    PubMed
    Summary
    This summary is machine-generated.

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    Motoneuron axotomy in frogs alters synaptic connections. Lateral column (LC) fiber synapses become slower, while dorsal root (DR) fiber synapses quicken, changing their relative timing and location.

    Area of Science:

    • Neuroscience
    • Spinal Cord Physiology
    • Synaptic Plasticity

    Background:

    • Synaptic connections in the spinal cord are crucial for motor control.
    • The precise location and physiological properties of synapses can change following neuronal injury.

    Purpose of the Study:

    • To investigate the effects of motoneuron axotomy on synaptic properties in the frog spinal cord.
    • To determine how synaptic location and electrophysiological characteristics of lateral column (LC) and dorsal root (DR) fibers change post-axotomy.

    Main Methods:

    • Ventral root transection (motoneuron axotomy) in frog spinal cord models.
    • Electrophysiological recordings to measure excitatory postsynaptic potentials (EPSPs) and their risetimes.
    • Focal potential analysis to map synaptic locations.

    Related Experiment Videos

  • Investigation of motoneuron membrane properties (input resistance, rheobasic current, threshold depolarization).

    • Main Results:

    • Following axotomy, the risetime of LC-EPSPs increased, while DR-EPSPs decreased, reversing their relative speeds.
    • LC synapses remained near the motor nucleus, whereas DR synapses shifted closer post-axotomy.
    • Axotomized motoneurons showed increased input resistance and rheobasic current, but resting potentials were unchanged.

    Conclusions:

    • Proximal synapses persist after axotomy but exhibit altered physiological properties affecting EPSP kinetics.
    • Changes in motoneuron membrane properties do not fully explain the observed alterations in LC- and DR-EPSPs.
    • Axotomy induces complex adaptations in synaptic transmission and neuronal excitability within the spinal cord.