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Related Experiment Videos

The palmo-mental reflex. An electrophysiological study.

H Dehen, N Bathien, J Cambier

    European Neurology
    |January 1, 1975
    PubMed
    Summary

    The palmo-mental reflex, a nociceptive response, is suppressed in healthy individuals but amplified in those with pyramidal or extra-pyramidal lesions. This reflex offers insights into neurological conditions.

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    Area of Science:

    • Neuroscience
    • Clinical Neurology

    Background:

    • The palmo-mental reflex is a poorly understood response to painful stimuli.
    • Suprasegmental control typically suppresses this reflex in healthy subjects.

    Purpose of the Study:

    • To investigate the characteristics of the palmo-mental reflex.
    • To determine the reflex's relationship with nociceptive responses.
    • To explore the reflex's alterations in pathological conditions.

    Main Methods:

    • Electric stimulation of ulnar nerve fibers in the wrist.
    • Recording of reflex responses in chin muscles and the flexor carpi ulnaris.
    • Inclusion of 7 normal and 32 pathological subjects.

    Main Results:

    • The palmo-mental reflex exhibits a short latency (down to 35 msec) and is often bilateral.
    • It occurs at the threshold of upper limb nociceptive reflexes.
    • The reflex is augmented in patients with bilateral pyramidal or extra-pyramidal lesions.

    Conclusions:

    • The palmo-mental reflex is an early component of a generalized nociceptive response.
    • Its suppression in healthy individuals indicates suprasegmental inhibition.
    • The reflex's liberation and augmentation suggest it's a marker for pyramidal or extra-pyramidal pathway damage.

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