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Related Experiment Videos

Quantitative analysis of the opossum's optic nerve: an electron microscope study.

J N Hokoç, E O Cruz

    The Journal of Comparative Neurology
    |April 15, 1978
    PubMed
    Summary

    Opossum optic nerve has 74,7000 fibers, with 20% unmyelinated. Myelinated fiber diameters range from 0.5-7 µm, showing a strong correlation between axon and myelin areas.

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    Brain research·2002

    Area of Science:

    • Neuroscience
    • Comparative Anatomy

    Background:

    • The optic nerve's structure is crucial for visual processing.
    • Understanding variations across species aids in comprehending neural organization.

    Purpose of the Study:

    • To characterize the fiber composition and morphology of the opossum (Didelphis marsupialis aurita) optic nerve.
    • To compare findings with other mammalian species.

    Main Methods:

    • Electron microscopy was employed to examine the optic nerve of Didelphis marsupialis aurita.
    • Fiber counting, diameter measurement, and myelin sheath analysis were performed.

    Main Results:

    • A total of 74,7000 fibers were identified, with approximately 20% being unmyelinated.
    • Myelinated fiber diameters ranged from 0.5-7 µm (mode 1.25 µm); unmyelinated fibers ranged from 0.25-2.25 µm (mode 0.75 µm).
    • A strong correlation (r=0.92) was observed between axon and myelin areas, with myelin thickness peaking at 0.77 relative to axon diameter.

    Conclusions:

    • The opossum optic nerve exhibits a distinct fiber population and size distribution.
    • Myelin sheath structure is comparable to other species, suggesting conserved mechanisms of myelination.

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