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Pyramidal tract function and the clinical "pyramidal syndrome".

M Wiesendanger

    Human Neurobiology
    |January 1, 1984
    PubMed
    Summary

    The pyramidal tract, traditionally linked to volitional movement, has a more complex role. This review explores its subsystems, motor control, sensory modulation, and contributions to fine motor skills and posture.

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    Area of Science:

    • Neuroscience
    • Motor Control
    • Clinical Neurology

    Background:

    • The traditional view of the pyramidal tract is limited, primarily based on stroke patient observations.
    • This perspective oversimplifies its role in volitional movements.
    • A broader understanding is needed to reconcile clinical and experimental concepts.

    Purpose of the Study:

    • To reconcile clinical terminology with experimental concepts of pyramidal tract function.
    • To present a more comprehensive perspective on the pyramidal tract's roles.
    • To highlight its involvement beyond basic volitional movement.

    Main Methods:

    • Literature review and synthesis of existing research.
    • Analysis of neurological observations and experimental findings.
    • Discussion of the pyramidal tract's subsystems and functions.

    Main Results:

    • The pyramidal tract comprises subsystems with distinct origins, terminations, and fiber sizes.
    • It shares motor control with other descending pathways and influences sensory inflow.
    • The system is crucial for digital skill, movement speed, and potentially postural control.

    Conclusions:

    • The pyramidal tract's function is multifaceted, extending beyond simple volitional movement.
    • Understanding its subsystems and interactions is key to a complete picture.
    • Further research should explore its role in postural control and sensory modulation.

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