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Cleavage in the chick embryo.

R Bellairs, F W Lorenz, T Dunlap

    Journal of Embryology and Experimental Morphology
    |February 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Early chick embryo development reveals distinct cellular structures. The subgerminal periblast has more yolk than cells, and specialized membranes in the marginal periblast may aid cell membrane formation.

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    Area of Science:

    • Developmental biology
    • Cell biology
    • Embryology

    Background:

    • Understanding early embryonic development is crucial for developmental biology.
    • The structural organization of the early chick embryo's cellular components remains an area of interest.

    Purpose of the Study:

    • To investigate the ultrastructural organization of the early chick embryo.
    • To characterize the distribution of yolk and cytoplasm in different embryonic regions.
    • To explore the potential role of specialized membrane structures in cell formation.

    Main Methods:

    • Transmission electron microscopy (TEM) was used to examine chick embryos.
    • Embryos were collected at various stages, from first cleavage to approximately 700 cells.
    • Ultrastructural features, including cortical regions, cytoplasm, yolk distribution, and membrane accumulations, were analyzed.

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    Main Results:

    • A yolk-free cortical region containing microfilaments was observed beneath the cell membrane.
    • Cytoplasm contained yolk spheres, with dorsal spheres smaller than ventral ones.
    • The subgerminal periblast had a higher yolk-to-cytoplasm ratio compared to proper cells.
    • Specialized membrane accumulations were identified in the marginal periblast.

    Conclusions:

    • The subgerminal periblast differs in composition from the proper cells.
    • The observed membrane accumulations in the marginal periblast may be involved in cell membrane formation during early development.