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Related Experiment Videos

Preparation of muscle samples for comparative electron microscopy.

T J Silva1, C E Bracker, M W Orcutt

  • 1Department of Animal Science, Purdue University, West Lafayette, IN 47907.

Journal of Animal Science
|August 1, 1992
PubMed
Summary

This study clarifies muscle structure interpretation using scanning electron microscopy (SEM). Results confirm that regularly spaced transverse structures and intermyofibrillar connections are Z-disks.

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Area of Science:

  • Muscle biology
  • Microscopy techniques
  • Ultrastructural analysis

Background:

  • Inconsistent interpretations of muscle ultrastructure exist in scientific literature.
  • Confusion surrounds the identification of T-tubules, transverse ridges, Z-disks, and intermyofibrillar connections.
  • Standardized methods are needed for accurate muscle structure analysis.

Purpose of the Study:

  • To evaluate how different sample preparation and imaging methods affect ultrastructural details of muscle.
  • To verify the commonality of transverse structures and intermyofibrillar connections under various viewing conditions.
  • To resolve discrepancies in the literature regarding muscle T-tubule and Z-disk identification.

Main Methods:

  • Utilized scanning electron microscopy (SEM) with a cold stage and at room temperature.

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  • Employed transmission electron microscopy (TEM) of thin sections.
  • Investigated sample preparation techniques including cold fracturing and sublimation.
  • Measured sarcomere length and spacing of intermyofibrillar connections.

    • Main Results:

    • SEM with a cold stage, SEM at room temperature, and TEM were optimal for revealing inter- and intracellular structures.
    • Cold-stage SEM, fracturing, and sublimation yielded excellent meat and muscle ultrastructure images.
    • Sarcomere length and intermyofibrillar connection spacing remained consistent across most preparation techniques.
    • Heat treatments affected sarcomere length and intermyofibrillar connection spacing similarly across methods.

    Conclusions:

    • Regularly spaced transverse structures observed via conventional SEM are Z-disks.
    • Intermyofibrillar connections identified using low-temperature SEM are also Z-disks.
    • This research provides clarity on muscle ultrastructure interpretation using advanced microscopy.