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Microfibrils in the myotendon junctions

T Ajiri, T Kimura, R Ito

    Acta Anatomica
    |January 1, 1978
    PubMed
    Summary
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    Researchers used electron microscopy to study bull frog myotendon junctions. They found microfibrils likely connect muscle myofibrils to tendon collagen fibers via the basement membrane.

    Area of Science:

    • Muscle biology
    • Connective tissue research
    • Electron microscopy

    Background:

    • Myotendon junctions are critical for force transmission from muscle to bone.
    • The precise structural mechanisms at the ultrastructural level remain incompletely understood.
    • Bull frogs provide a model system for studying vertebrate muscle anatomy.

    Purpose of the Study:

    • To investigate the ultrastructure of myotendon junctions in the bull frog rectus abdominis.
    • To elucidate the molecular connections between muscle fibers and tendon.
    • To identify potential intermediate structures facilitating force transfer.

    Main Methods:

    • Specimen preparation using a dual fixation technique: tannic acid and glutaraldehyde.
    • High-resolution imaging via electron microscopy.

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  • Detailed analysis of cellular and extracellular matrix components at the junction.

    • Main Results:

    • Deep invaginations of the muscle cell membrane were observed at the muscle fiber ends.
    • Terminal myofibril filaments attached to an electron-dense layer within these invaginations.
    • A thickened basement membrane and tapering collagen fibers were noted within the invaginations.
    • Microfibrils were visualized extending from the cell membrane, through the basement membrane, to collagen fibers.

    Conclusions:

    • The study suggests microfibrils act as intermediaries connecting muscle myofibrils to tendon collagen.
    • These microfibrils, along with the basement membrane, likely play a crucial role in force transmission at the myotendon junction.
    • The findings provide new ultrastructural insights into the structural integrity of the muscle-tendon complex.