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Related Experiment Videos

Spinal evoked response in the cat.

R J Sarnowski, R Q Cracco, H B Vogel

    Journal of Neurosurgery
    |September 1, 1975
    PubMed
    Summary
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    Summated evoked potentials in cats were recorded from the spinal cord surface. This study demonstrates a potential animal model for studying spinal cord pathology.

    Area of Science:

    • Neuroscience
    • Spinal Cord Physiology
    • Evoked Potentials

    Background:

    • Evoked potentials provide insights into neural pathway function.
    • Understanding spinal cord afferent pathways is crucial for diagnosing neurological conditions.

    Purpose of the Study:

    • To investigate the characteristics of summated evoked potentials recorded from the cat spinal cord surface following sciatic nerve stimulation.
    • To determine the origin and pathways of these evoked potentials.
    • To assess the utility of this recording method as an animal model for spinal cord pathology.

    Main Methods:

    • Sciatic nerve stimulation in cats.
    • Recording of summated evoked potentials using surface electrodes along the spinal cord.
    • Comparison with stimulation of other peripheral nerves (sural, medial gastrocnemius).

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  • Analysis of responses in intact and partially transected spinal cords.

    • Main Results:

    • Evoked potentials showed increasing latency and complexity from caudal to rostral spinal cord.
    • Conduction velocity was approximately 90 m/sec.
    • Responses were primarily mediated by muscle nerve afferents.
    • Signal amplitude, duration, and complexity increased with electrode depth.
    • Transmission failure occurred across complete spinal cord transections.
    • Partial transections indicated mediation by multiple ipsilateral afferent pathways.

    Conclusions:

    • Summated evoked potentials from spinal cord afferent pathways are recordable from the surface in cats.
    • The findings suggest this animal model is valuable for studying spinal cord pathology.
    • The study elucidates the characteristics and pathways of these evoked potentials.