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Related Experiment Videos

The multicomposite structure of tendon.

J Kastelic, A Galeski, E Baer

    Connective Tissue Research
    |January 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a new model for tendon crimp structure, revealing fascicles as cylindrical arrays of crimped collagen fibrils. These findings enhance our understanding of tendon morphology and biomechanics.

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    Area of Science:

    • Biomaterials Science
    • Connective Tissue Research
    • Structural Biology

    Background:

    • Tendons exhibit a hierarchical structure crucial for mechanical function.
    • The crimp structure of collagen fibrils within tendons influences mechanical properties.
    • Previous models lacked detailed morphological descriptions of fascicle organization.

    Purpose of the Study:

    • To present a revised morphological model of tendon crimp structure.
    • To elucidate the arrangement of collagen fibrils within fascicles.
    • To verify the cylindrical symmetry of fascicles and planar crimp of fibrils.

    Main Methods:

    • Polarizing microscopy to observe fascicle crimp structure.
    • Scanning Electron Microscopy (SEM) to assess fascicle symmetry.

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  • Optical microscopy with refractive index matching to improve collagen fibril visualization.
  • Small-angle X-ray diffraction to verify fibril crimp and fascicle arrangement.

    • Main Results:

    • Rat tail tendons consist of fascicles (80-320 mu diameter) with demonstrable crimp structure.
    • Fascicles are cylindrical arrays of planar-zig-zag crimped collagen fibrils (500-5000 A diameter).
    • Cylindrical symmetry of fascicles and planar crimp of fibrils were verified by microscopy and X-ray diffraction.

    Conclusions:

    • A revised morphological model accurately describes tendon fascicle structure.
    • The planar crimp of collagen fibrils and their organization into symmetric fascicles are key structural features.
    • Improved optical methods enhance visualization of collagen fibril morphology.