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Related Experiment Videos

Somitomeres in the chick tail bud: an SEM study.

R Bellairs, E J Sanders

    Anatomy and Embryology
    |January 1, 1986
    PubMed
    Summary

    In chick embryos, the final somite count is reached by stage 22. Unsegmented paraxial mesoderm in the tail bud contains somitomeres, suggesting potential for additional somite formation.

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    Endpoints in the development of chick embryos.

    Toxicology in vitro : an international journal published in association with BIBRA·2010

    Area of Science:

    • Developmental biology
    • Embryology
    • Cellular biology

    Background:

    • Somite formation is a key process in vertebrate embryonic development.
    • In chick embryos (Gallus gallus), somite segmentation is typically complete by Hamburger and Hamilton stage 22.
    • The posterior-most paraxial mesoderm in the tail bud remains unsegmented at this stage.

    Purpose of the Study:

    • To investigate the presence and nature of unsegmented mesoderm in the chick embryo tail bud.
    • To determine if the terminal paraxial mesoderm has the potential for further somite formation.

    Main Methods:

    • Scanning electron microscopy (SEM) was utilized to examine the ultrastructure of the tail bud.
    • Analysis focused on the paraxial mesoderm region of the chick embryo tail bud at approximately stage 22.

    Main Results:

    • Somitomere structures were identified within the unsegmented paraxial mesoderm of the tail bud.
    • These somitomeres indicate a pre-segmental organization in the terminal mesoderm.

    Conclusions:

    • The terminal paraxial mesoderm in the chick embryo tail bud contains somitomeres.
    • This finding suggests that the tail bud mesoderm retains the potential to form supplementary somites.
    • The precise mechanisms preventing complete segmentation at the tip remain unknown.

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