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Related Experiment Videos

Does cross-innervation occur after facial palsy?

W Trojaborg

    Journal of Neurology, Neurosurgery, and Psychiatry
    |July 1, 1977
    PubMed
    Summary

    Contralateral muscle responses observed during facial nerve stimulation suggest muscle fiber crossing, not nerve cross-innervation, in facial palsy patients. This finding offers new insights into facial muscle activation pathways.

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    Area of Science:

    • Neurology
    • Neurophysiology
    • Facial Nerve Anatomy

    Background:

    • Facial palsy involves paralysis of facial muscles.
    • The exact mechanism of muscle activation in facial palsy is not fully understood.
    • Cross-innervation of facial muscles is a debated topic.

    Purpose of the Study:

    • To investigate the origin of muscle responses in the paralyzed side of the face during stimulation of the unaffected facial nerve.
    • To differentiate between nerve cross-innervation and other mechanisms contributing to contralateral muscle activation.

    Main Methods:

    • Stimulation of the unaffected facial nerve in 30 patients with facial palsy.
    • Recording of evoked action potentials from contralateral perioral muscles.
    • Similar stimulation and recording in four healthy subjects.
    • Analysis of response latency and conduction velocity.

    Main Results:

    • Evoked action potentials were recorded from contralateral perioral muscles in patients with facial palsy.
    • Similar contralateral responses were observed in normal subjects.
    • Response latency remained stable over months in patients.
    • Conduction velocity was consistent with muscle fiber conduction.

    Conclusions:

    • Contralateral responses are likely caused by muscle fibers crossing the midline.
    • Nerve cross-innervation is less likely to be the primary mechanism.
    • Findings provide evidence for a novel pathway of muscle activation in facial palsy.

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