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Related Experiment Videos

Scanning electron microscope study of the developing trout pelvic fin bud.

J Géraudie

    The Anatomical Record
    |July 1, 1978
    PubMed
    Summary

    This study reveals unique "tassel cells" with fluffy protuberances on fish pelvic fin buds. These cells, crucial for fin development, are not found in tetrapod limb buds, suggesting a unique aquatic adaptation.

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    Area of Science:

    • Developmental Biology
    • Comparative Anatomy
    • Ichthyology

    Background:

    • The pelvic fin bud is crucial for fish locomotion and balance.
    • Understanding appendage development in different vertebrate classes provides insights into evolutionary pathways.

    Purpose of the Study:

    • To investigate the cellular characteristics of the developing fish pelvic fin bud using Scanning Electron Microscopy (SEM).
    • To identify and describe the unique epidermal structures present during fin development.

    Main Methods:

    • Scanning Electron Microscopy (SEM) was employed to examine the surface morphology of the fish pelvic fin bud.
    • Detailed observation and documentation of epidermal cell features and the pseudoapical epidermal ridge were performed.

    Main Results:

    • SEM revealed distinctive "tassel cells" with fluffy protuberances on the epidermal surface of the fin bud.
    • These tassel cells were initially abundant across the bud but became restricted to the base as development progressed.
    • The pseudoapical epidermal ridge, characterized by these cells, was identified at the free margin of the fin bud.

    Conclusions:

    • The identified tassel cells and their unique surface structures appear to be specific to fish fin development.
    • This finding highlights a potential divergence in limb/fin bud development between aquatic and terrestrial vertebrates.

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