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Related Experiment Videos

[Quick-freeze, deep-etch study of monkey lamina cribrosa]

K Abe1, M Furuta, S Tsukahara

  • 1Department of Ophthalmology, Yamanashi Medical College, Japan.

Nippon Ganka Gakkai Zasshi
|August 1, 1995
PubMed
Summary

This study reveals the intricate ultrastructure of the monkey optic nerve lamina cribrosa, detailing glial cell and extracellular matrix components. It clarifies how these structures support optic nerve axons and protect blood vessels.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Cell Biology

Context:

  • The optic nerve lamina cribrosa is crucial for vision, yet its detailed ultrastructure remains incompletely understood.
  • Understanding the lamina cribrosa's cellular and extracellular matrix composition is vital for diagnosing and treating optic neuropathies.

Purpose:

  • To elucidate the ultrastructure of the normal monkey optic nerve lamina cribrosa using quick-freeze, deep-etch electron microscopy.
  • To characterize the arrangement and interaction of glial cells, collagen fibers, and basement membranes within the lamina cribrosa.

Summary:

  • Glial cells in the lamina cribrosa contain intermediate filaments and abut the myelin sheath of optic nerve axons.
  • The extracellular matrix consists mainly of collagen fibers (30-60 nm) bridged by smaller structures.

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  • Blood vessels are isolated from axons by basement membranes, extracellular matrix, and glial components.

    • Impact:

    • Provides a detailed ultrastructural map of the lamina cribrosa, essential for understanding its mechanical properties and vulnerability in diseases like glaucoma.
    • Highlights the structural basis for separating blood vessels from optic nerve axons, potentially explaining differential susceptibility to injury.
    • Offers insights into the cytoskeletal organization of glial cells and the composition of the extracellular matrix, informing future research on optic nerve regeneration and repair.