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Physiological aspects of synaptic plasticity: the Ia/motoneuron connection as a model
1Department of Neurobiology and Behavior, State University of New York, Stony Brook 11794.
Advances in Neurology
|January 1, 1988
Summary
Peripheral nerve damage alters spinal reflex function, reducing synaptic transmission. Recovery occurs with reinnervation, but spinal cord injuries cause unpredictable changes in reflex activity.
Area of Science:
- Neuroscience
- Spinal Cord Injury Research
- Peripheral Nerve Regeneration
Background:
- Peripheral nerve damage significantly impacts spinal cord function, affecting monosynaptic reflexes.
- Alterations in synaptic transmission are observed independently following damage to either pre- or postsynaptic neurons.
Purpose of the Study:
- To investigate the functional consequences of peripheral nerve and spinal cord injuries on synaptic transmission.
- To elucidate the mechanisms underlying changes in reflex activity post-injury.
Main Methods:
- Electrophysiological analysis of synaptic transmission in spinal cord models.
- Assessment of reflex pathways following peripheral nerve axotomy and spinal cord lesions.
Main Results:
- Peripheral nerve injury leads to depressed synaptic transmission (EPSP amplitude), which is reversible upon reinnervation.
- Spinal cord injuries result in more variable synaptic alterations, often enhancing EPSPs but with unpredictable net effects on reflex transmission due to motoneuron hyperpolarization.
Conclusions:
- Synaptic transmission is profoundly affected by both peripheral nerve and spinal cord injuries, with distinct and complex outcomes.
- Altered motoneuron properties and synaptic plasticity contribute to functional deficits, highlighting the interconnectedness of the nervous system.
- Predicting functional recovery after central nervous system lesions remains challenging due to complex interactions between synaptic and cellular changes.