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Three-dimensional observation on muscular tissues.

H Sawada

    Scanning Electron Microscopy
    |January 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    This study used advanced microscopy to reveal detailed 3D structures of frog striated muscle and guinea pig smooth muscle cells, including unique filament arrangements and cellular components.

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    Area of Science:

    • Cell Biology
    • Muscle Physiology
    • Microscopy Techniques

    Background:

    • Understanding muscle cell structure is crucial for comprehending muscle function.
    • Previous imaging techniques had limitations in visualizing fine cellular details.

    Purpose of the Study:

    • To provide a high-resolution three-dimensional ultrastructural analysis of striated and smooth muscle cells.
    • To investigate the detailed organization of myofibrils, plasmalemma, and sarcoplasmic reticulum.

    Main Methods:

    • Field Emission Scanning Electron Microscopy (FE-SEM) for surface and internal views.
    • Freeze-Fracture Deep-Etching (FFDE) for enhanced visualization of fine structures.
    • Comparative analysis of frog sartorius (striated) and guinea pig taenia coli (smooth) muscle cells.

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    Main Results:

    • FE-SEM revealed caveolae, filaments, and myofibril banding patterns (40 nm periodicity) in striated muscle.
    • Smooth muscle cells showed plasmalemmal caveolae, filament bundles, and internal organelles like microtubules and mitochondria.
    • FFDE imaging elucidated myosin filament projections and inter-myofilament connections, adding finer detail to SEM observations.
    • Granular material networks were observed within the sarcoplasmic reticulum terminal cisternae.

    Conclusions:

    • Combined FE-SEM and FFDE offer unprecedented 3D ultrastructural detail of muscle cells.
    • The study clarifies the intricate arrangement of contractile and associated proteins within both muscle types.
    • Detailed visualization of sarcoplasmic reticulum provides insights into calcium handling mechanisms.