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Related Experiment Videos

Spinal cord evaluation by cortical evoked responses.

J F Cusick, J B Myklebust, S J Larson

    Archives of Neurology
    |March 1, 1979
    PubMed
    Summary

    Selective spinal cord lesions in monkeys show that dorsal column pathways are crucial for transmitting sensory information to the cortex. Preserving these pathways maintains signal transmission, while ventral column damage disrupts it.

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    Area of Science:

    • Neuroscience
    • Spinal Cord Physiology
    • Sensory Pathways

    Background:

    • The dorsal columns of the spinal cord are known sensory pathways.
    • Understanding their role in transmitting somatosensory information is critical.

    Purpose of the Study:

    • To investigate the role of dorsal column pathways in transmitting cortical evoked potentials.
    • To determine the impact of selective spinal cord lesions on sensory signal transmission.

    Main Methods:

    • Induction of selective segmental lesions in the dorsal columns of ten monkeys.
    • Recording of cortical evoked potential responses to peripheral nerve stimulation.
    • Assessment of signal transmission at various neural levels (spinal cord, thalamus, cortex).

    Main Results:

    • Dorsal column lesions caused significant attenuation of cortical evoked potentials.
    • Preservation of dorsal columns maintained evoked response transmission.
    • Ventral column ablation markedly attenuated thalamic responses.

    Conclusions:

    • The dorsal column pathway is essential for transmitting sensory evoked potentials to the cortex.
    • Selective lesions confirm the functional segregation of sensory information within the spinal cord.

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