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Related Experiment Videos

Ultrastructural variations in frog muscles subjected to sciatectomy.

T Somasekhar, Y Ramamohan, R V Krishnamoorthy

    Indian Journal of Experimental Biology
    |October 1, 1989
    PubMed
    Summary

    Scietectomy caused significant muscle fiber damage in frog gastrocnemius but less in sartorius. Muscle degeneration severity correlated with denervation atrophy and likely fiber type differences.

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    Area of Science:

    • Muscle physiology
    • Cell biology
    • Comparative anatomy

    Background:

    • Scietectomy is a surgical procedure involving the sciatic nerve.
    • Muscle atrophy results from denervation, impacting muscle structure and function.
    • Different muscle types exhibit varying responses to denervation.

    Purpose of the Study:

    • To investigate the fine structural changes in frog gastrocnemius and sartorius muscles after sciatectomy.
    • To compare the degenerative effects of denervation on different muscle fiber types.
    • To correlate structural variations with the degree of denervation atrophy.

    Main Methods:

    • Electron microscopy was used to examine muscle ultrastructure.
    • Scietectomy was performed on Rana cyanophlictis (frog).
    • Muscle wet weight was measured to assess atrophy.

    Main Results:

    • Gastrocnemius muscle displayed significant myofibrillar disarray and degeneration post-sciatectomy.
    • Sartorius muscle showed comparatively milder degenerative changes.
    • The extent of structural variation was proportional to the loss of muscle wet weight.

    Conclusions:

    • Frog muscle fiber types exhibit differential susceptibility to denervation-induced atrophy.
    • Variations in fiber composition and biomechanical factors (stretch) may influence degenerative patterns.
    • Ultrastructural analysis provides insights into muscle adaptation and degeneration processes.

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