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Related Experiment Videos

Jaw muscle activity during chin-tapping.

B Lennartsson

    Acta Odontologica Scandinavica
    |January 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Jaw-jerk reflex responses were measured in dental students using electromyography (EMG). The masseter and temporal muscles showed a monosynaptic reflex, unlike the anterior digastric muscle.

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    Area of Science:

    • Neurology
    • Physiology
    • Biomedical Engineering

    Background:

    • The jaw-jerk reflex is a crucial component of masticatory muscle function.
    • Understanding the neural pathways involved in jaw reflexes is essential for diagnosing and treating orofacial disorders.

    Purpose of the Study:

    • To investigate and compare the electromyographic (EMG) responses of the masseter, anterior temporal, and anterior digastric muscles to mechanical jaw stimulation.
    • To determine the presence or absence of a monosynaptic reflex in these muscles.

    Main Methods:

    • Electromyographic (EMG) activity was recorded from the masseter, anterior temporal, and anterior digastric muscles in ten dental students.
    • Taps were administered upwards and downwards to the chin, with muscles in both relaxed and contracting states.

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  • Intracutaneous platinum hook electrodes and concentric needle electrodes were utilized for muscle recording.

    • Main Results:

    • The jaw-jerk reflex latency in the masseter muscle was 7.8 ms and in the temporal muscle was 8.4 ms during downward tapping.
    • During upward tapping, the anterior digastric muscle showed EMG activity with latencies ranging from 13 to 34 ms.
    • No signs of a monosynaptic reflex were observed in the anterior digastric muscle.

    Conclusions:

    • The masseter and temporal muscles, rich in muscle spindles, exhibit a monosynaptic jaw-jerk reflex.
    • The anterior digastric muscle, with few or no muscle spindles, does not show a monosynaptic reflex response to similar stimulation.
    • These findings highlight the differential neural control mechanisms governing jaw muscles.