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A dorsolateral spinothalamic pathway in cat.

M W Jones, C J Hodge, A V Apkarian

    Brain Research
    |May 27, 1985
    PubMed
    Summary
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    A newly discovered spinothalamic tract originates from spinal lamina I neurons and travels in the dorsolateral funiculus. This pain pathway offers new insights into how the body processes noxious stimuli.

    Area of Science:

    • Neuroscience
    • Spinal Cord Research
    • Pain Processing

    Background:

    • The spinothalamic tract is a major pathway for pain and temperature sensation.
    • Classical spinothalamic tract pathways are well-established.
    • Spinal lamina I neurons are known to respond to noxious stimuli.

    Purpose of the Study:

    • To identify and characterize a novel spinothalamic tract originating from spinal lamina I.
    • To investigate the course and properties of this distinct pain pathway.
    • To understand its role in the processing of noxious stimuli.

    Main Methods:

    • Retrograde transport of horseradish peroxidase in feline spinal cord.
    • Anatomical tracing of neuronal projections.
    • Electrophysiological recording (implied by response data).

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    Main Results:

    • A spinothalamic tract originating predominantly from lamina I neurons was identified.
    • This tract courses within the dorsolateral funiculus of the spinal cord.
    • The projection is primarily contralateral and lies outside the classical spinothalamic tract course.

    Conclusions:

    • A distinct spinothalamic tract originating from lamina I neurons exists.
    • This pathway represents a significant component of pain processing.
    • It has implications for understanding how noxious stimuli are relayed in the central nervous system.