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Related Experiment Videos

Small-square (SS) net exists in trout muscle.

Y Hirai1, M Yamaguchi, S Yamano

  • 1Department of Veterinary Anatomy, School of Veterinary Medicine, Ohio State University, Columbus 43210.

Acta Biochimica Et Biophysica Hungarica
|January 1, 1989
PubMed
Summary

The small-square-net form was identified in brown trout muscle, coexisting with the basket-weave pattern. This finding supports a unified model of vertebrate striated muscle structure.

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Area of Science:

  • Muscle Biology
  • Cellular Ultrastructure
  • Comparative Anatomy

Background:

  • Vertebrate striated muscle exhibits diverse structural patterns in cross-sections.
  • Previous studies using guppy tissue were inconclusive in demonstrating the small-square-net pattern.
  • Trout tissue may be less susceptible to stress than guppy tissue, aiding observation.

Purpose of the Study:

  • To provide clear evidence of the small-square-net form in fish muscle.
  • To investigate the coexistence of different structural patterns in muscle fibers.
  • To support a unified model of Z-line structure in vertebrate striated muscle.

Main Methods:

  • Preparation of brown trout adductor mandibularis and dorsal muscle strips.
  • Fixation using glutaraldehyde and osmium tetroxide, followed by dehydration and embedding.

Related Experiment Videos

  • Electron microscopic observation of cross-sections stained with uranyl acetate and lead citrate.

    • Main Results:

    • Clear observation of the small-square-net form in brown trout muscle cross-sections.
    • The small-square-net form was found to coexist with the basket-weave pattern.
    • This provides the first clear evidence of the small-square-net form in fish muscle.

    Conclusions:

    • The diverse structural patterns in vertebrate striated muscle likely originate from a common basic unit.
    • Findings align with the proposed unified model of narrow and wide Z-line structure.
    • Brown trout muscle is a suitable model for studying muscle ultrastructure.