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Functional plasticity following spinal cord lesions.

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Spinal cord injury alters reflex pathways, initially depressing then exaggerating reflexes. Modifying these reflexes, particularly through step training, is key to restoring locomotion after spinal cord injury.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Spinal Cord Injury Research

Background:

  • Spinal cord injury (SCI) causes significant reorganization of reflex pathways below the injury site.
  • Loss of descending input alters primary afferents, interneurons, and motoneurons, impacting sensorimotor integration.
  • Reflexes are typically depressed post-SCI due to reduced motoneuron excitability, but can recover and become exaggerated.

Purpose of the Study:

  • To investigate the role of modified reflex pathways in sensorimotor function after SCI.
  • To explore the mechanisms underlying spasticity and altered locomotion post-SCI.
  • To examine how interventions like step training affect reflex pathways and locomotor recovery.

Main Methods:

  • Analysis of reflex pathway modifications following spinal cord lesions.
  • Assessment of motoneuron excitability and membrane properties.
  • Observation of locomotion recovery in spinally transected animals, particularly during treadmill locomotion.
  • Evaluation of the impact of step training on reflex pathway transmission.

Main Results:

  • Reflexes initially depressed post-SCI recover and can become exaggerated.
  • Altered inhibitory connections and motoneuron excitability contribute to spasticity and abnormal locomotion.
  • Cats with thoracic spinal lesions can recover locomotion on a treadmill.
  • Step training influences transmission in simple reflex pathways after complete spinal lesions, aiding locomotor recovery.

Conclusions:

  • Modified reflex pathways and altered motoneuron properties are central to sensorimotor deficits after SCI.
  • Normalization of afferent inflow and reflex pathway transmission is crucial for re-establishing stable locomotion.
  • Step training is a promising intervention that directly modulates reflex pathways to promote locomotor recovery in spinal animals.