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Related Experiment Videos

Functional heterogeneity in a multipinnate muscle.

S W Herring, A F Grimm, B R Grimm

    The American Journal of Anatomy
    |April 1, 1979
    PubMed
    Summary
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    Complex mammalian muscles, like the pig masseter, can generate varied forces. Selective muscle region activation during chewing demonstrates this, challenging traditional biomechanical models.

    Area of Science:

    • Biomechanics
    • Muscle Physiology
    • Mammalian Anatomy

    Background:

    • Mammalian muscles often exhibit complex internal architectures.
    • This complexity suggests potential for generating diverse force vectors via regional contractions.

    Purpose of the Study:

    • To investigate the functional implications of complex muscle architecture.
    • To test the hypothesis that selective regional contractions produce varied force vectors in the multipinnate pig masseter muscle.

    Main Methods:

    • Electromyography was used to record muscle activity from multiple intramuscular sites simultaneously.
    • Analysis included correlating muscle activity with fasciculus orientation, sarcomere length, and fiber type.

    Main Results:

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  • Differential activity was observed across various portions of the pig masseter during mastication phases.
  • Anatomical factors such as fasciculus orientation, sarcomere length, and fiber type correlated with this differential activity.

    • Conclusions:

    • The pig masseter displays systematic regional activation during mastication.
    • Standard biomechanical assumptions of uniform contraction and constant line of action are inadequate for complex muscles.