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Dual dorsal columns: a review

C H Beck

    The Canadian Journal of Neurological Sciences. Le Journal Canadien Des Sciences Neurologiques
    |February 1, 1976
    PubMed
    Summary

    Wall's (1970) conclusion that dorsal column lesions cause no sensory defects is challenged. New evidence suggests significant sensory deficits and motor disturbances, indicating two distinct dorsal column nuclei subsystems with differing functions.

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    Area of Science:

    • Neuroscience
    • Sensory Systems
    • Motor Control

    Background:

    • The dorsal column-medial lemniscus pathway is crucial for proprioception and fine touch.
    • Wall (1970) proposed that dorsal column lesions do not cause significant sensory deficits.
    • Contradictory evidence and ongoing research necessitate a re-evaluation of this hypothesis.

    Purpose of the Study:

    • To critically review the evidence regarding sensory deficits following dorsal column lesions.
    • To investigate the potential dissociation of sensory and motor functions within the dorsal column nuclei.
    • To explore the functional implications of identified subsystems.

    Main Methods:

    • Review of anatomical literature.
    • Review of electrophysiological studies.
    • Analysis of existing research on dorsal column lesions.

    Main Results:

    • Much of the evidence supporting Wall's (1970) conclusion is inconclusive.
    • Several studies report significant sensory deficits in animals with dorsal column lesions.
    • Evidence supports Wall's findings of motor disturbances from dorsal column lesions.
    • Growing evidence suggests two distinct subsystems within the dorsal column nuclei.

    Conclusions:

    • Wall's (1970) assertion regarding the absence of sensory defects may be premature.
    • Dorsal column lesions can result in significant sensory impairments.
    • The dorsal column nuclei likely process distinct sensory information through separate subsystems.
    • Further research is needed to fully elucidate the functions of these subsystems.

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