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Related Experiment Videos

[Electromyographic study on lateral jaw movements].

T Nakamura, K Yoshikawa, T Omae

    Nihon Ago Kansetsu Gakkai Zasshi
    |January 1, 1989
    PubMed
    Summary
    This summary is machine-generated.

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    Hinyokika kiyo. Acta urologica Japonica·1992

    Jaw-closing muscle activity during lateral movement shows distinct patterns. The posterior temporal muscle is active, while the masseter muscle activates bilaterally, suggesting differences in muscle function during jaw excursions.

    Area of Science:

    • Biomechanics of mastication
    • Neuromuscular control of jaw movements

    Context:

    • Understanding jaw muscle function is crucial for diagnosing and treating temporomandibular disorders.
    • Previous research has focused on chewing, but lateral jaw movements are less understood.

    Purpose:

    • To analyze the modulation of jaw-closing muscle activities during lateral jaw movements.
    • To investigate the relationship between muscle activity, tooth contact, and lateral jaw excursions.

    Summary:

    • Electromyograms of masseter, anterior temporal, and posterior temporal muscles were recorded during lateral jaw movements in healthy young adults.
    • The working-side posterior temporal muscle showed high activity, independent of tooth contact.
    • The masseter muscle exhibited activity during both ipsilateral and contralateral lateral movements.

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    Impact:

    • This study highlights differential activation patterns between masseter and temporal muscles during lateral jaw movements.
    • Findings contribute to a better understanding of the neuromuscular mechanisms governing jaw function.