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Morphometry of human neck muscles

L K Kamibayashi1, F J Richmond

  • 1Department of Physiology, Queen's University, Kingston, Ontario.

Spine
|July 9, 1998
PubMed
Summary
This summary is machine-generated.

This study microdissected neck muscles to precisely measure their architecture. Findings reveal significant complexity and variation, improving models of neck muscle function.

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Area of Science:

  • Anatomy
  • Biomechanics
  • Kinesiology

Background:

  • Previous neck muscle anatomy studies used limited methods, failing to account for complex fiber arrangements.
  • Accurate force-generating models require precise morphometric data, including fascicle and sarcomere lengths, which were previously unaddressed.

Purpose of the Study:

  • To systematically describe musculotendinous lengths, fascicle lengths, pennation angles, and physiologic cross-sectional areas of neck and shoulder muscles.
  • To improve the accuracy of morphometric measurements by incorporating microdissection techniques.

Main Methods:

  • Cadaveric dissections of 14 neck muscles from 10 human cadavers.
  • Microdissection to analyze muscle architecture, including fascicle length, pennation angle, and sarcomere length.

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  • Calculation of physiologic cross-sectional areas from morphometric data.

    • Main Results:

    • Neck musculature is architecturally complex, with muscles crossing multiple joints and having varied attachments.
    • Significant interindividual variations were observed in muscle size, shape, and tendinous insertions.
    • Muscle cross-sectional areas did not scale proportionately with body size, indicating unique architectural adaptations.

    Conclusions:

    • Microdissection of neck muscles enhances morphometric accuracy, particularly by accounting for aponeurotic attachments.
    • Failure to identify internal structures can lead to underestimates of muscle cross-sectional areas.
    • Normalizing sarcomere lengths improves the accuracy of generalized neck models.