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Selectivity in synaptic changes caudal to acute spinal cord transection.

T C Cope, S G Nelson, L M Mendell

    Neuroscience Letters
    |December 1, 1980
    PubMed
    Summary
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    Spinal cord transection did not alter semitendinosus (ST) Ia EPSPs in ST motoneurons. However, medial gastrocnemius (MG) Ia EPSPs were enlarged, suggesting selective plasticity independent of injury.

    Area of Science:

    • Neuroscience
    • Motor control
    • Spinal cord injury

    Background:

    • Monosynaptic reflexes are crucial for motor control.
    • Spinal cord injury can lead to changes in neuronal excitability and synaptic plasticity.
    • Previous studies showed EPSP enlargement at the medial gastrocnemius (MG) Ia fiber-motoneuron synapse after spinal cord transection.

    Purpose of the Study:

    • To investigate the effect of spinal cord transection on the semitendinosus (ST) Ia fiber-motoneuron synapse.
    • To compare the plasticity of ST and MG Ia synapses following spinal cord injury.

    Main Methods:

    • Electrophysiological recordings in motoneurons.
    • Single-unit extracellular recordings of Ia afferent fiber activity.
    • Spinal cord transection at the T13 segment in an animal model.

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    Main Results:

    • The amplitude of EPSPs in ST motoneurons evoked by single ST Ia afferents showed little to no increase hours after spinal cord transection.
    • In contrast, EPSPs evoked by MG Ia afferents in MG motoneurons were enlarged in the same preparations.
    • This indicates a selective plasticity at the MG Ia synapse not directly caused by the spinal cord injury itself.

    Conclusions:

    • The response of Ia afferent synapses to spinal cord injury is synapse-specific.
    • Plasticity at the MG Ia synapse is selective and not a generalized consequence of spinal cord transection.
    • Further research is needed to understand the mechanisms underlying this selective synaptic plasticity.