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Related Experiment Videos

The central nervous system in scanning electron microscopy.

F N Low

    Scanning Electron Microscopy
    |January 1, 1982
    PubMed
    Summary
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    Scanning electron microscopy reveals details of the central nervous system's ventricular and subarachnoid spaces. Research highlights circumventricular organs, supraependymal cells, and macrophage presence, with ongoing exploration of deeper brain structures.

    Area of Science:

    • Neuroscience
    • Microscopy
    • Central Nervous System (CNS) Anatomy

    Background:

    • The initial decade of scanning electron microscopy (SEM) focused on the CNS, particularly the ventricular system.
    • Circumventricular organs, located near the third and fourth ventricles, are key areas of study.
    • These organs exhibit unique cellular compositions, including supraependymal cells and tanycytes.

    Purpose of the Study:

    • To summarize findings from the first decade of SEM applied to the central nervous system.
    • To detail the morphology and cellular components of the ventricular system and circumventricular organs.
    • To describe the characteristics of the subarachnoid space and its cellular elements.

    Main Methods:

    • Scanning electron microscopy (SEM) was the primary technique employed.

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  • Fracturing, isolation, and ultrasonication were used to examine non-surface CNS areas.
  • Histological and immunological properties of connective tissues were inferred.

    • Main Results:

    • SEM provided detailed visualization of the ventricular system, including circumventricular organs.
    • Supraependymal cells (neurons, phagocytes), tanycytes, and occasional blood vessels were identified.
    • The subarachnoid space was characterized by flat connective tissues with fenestrations and macrophages.

    Conclusions:

    • Circumventricular organs possess neurosecretory functions, established for some and suspected for most.
    • The subarachnoid space exhibits connective tissue characteristics and immune cell presence (macrophages).
    • Established methodologies for examining deeper, non-surface CNS areas using SEM are still emerging.