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Related Experiment Videos

Fourth ventricular floor in human embryos: scanning electron microscopic observations.

O Tanaka, H Otani, K Fujimoto

    The American Journal of Anatomy
    |February 1, 1987
    PubMed
    Summary

    Scanning electron microscopy revealed distinct surface features on the embryonic fourth ventricular floor. Supraependymal cells and fibers were identified, suggesting early neuronal and phagocytic functions during human development.

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    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Human Embryology

    Background:

    • The fourth ventricle floor is crucial for brain development.
    • Understanding its early ultrastructural features is key to comprehending neural development.

    Purpose of the Study:

    • To characterize the ultrastructural surface morphology of the human embryonic fourth ventricular floor.
    • To identify and classify supraependymal cells and fibers in early human embryos.

    Main Methods:

    • Scanning electron microscopy (SEM) was used to examine seven human embryos (Carnegie stage 14-19).
    • Analysis focused on low-power and high-power SEM observations of the ventricular floor surface.

    Main Results:

    • Transient structures like the median sulcus, sulcus limitans, and neuromeres were observed.

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  • Supraependymal cells (SE cells) were classified into two types: type 1 (putative neuronal) and type 2 (putative phagocytic).
  • Supraependymal fibers (SE fibers) showed specific localization patterns and interacted with SE cells and the ependymal layer.

    • Conclusions:

    • The study describes the distinct ultrastructural features of the early human embryonic fourth ventricular floor.
    • SE cells and fibers exhibit specialized localizations and morphologies, indicating potential roles in neural development and signaling.