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Related Experiment Videos

Are Ranvier's nodes artifacts by preparation?

E Gerhardt1

  • 1Institute of Neuroanatomy, University of Hamburg, FRG.

Acta Anatomica
|January 1, 1991
PubMed
Summary
This summary is machine-generated.

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Ranvier's nodes are not visible in intact living nerve fibers and do not exist in their natural state. Their appearance is an artifact caused by external thermal or chemical influences.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Microscopy

Background:

  • Traditional understanding of nerve fiber structure includes nodes of Ranvier.
  • Previous studies often relied on fixed or treated nerve samples.

Purpose of the Study:

  • To investigate the in-situ structure of native nerve fibers.
  • To determine the existence and appearance of nodes of Ranvier in intact living nerves.

Main Methods:

  • Phase contrast light microscopy of native nerve fibers.
  • Electron micrography for high-resolution imaging.

Main Results:

  • Nodes of Ranvier were not observed in intact, living nerve fibers.
  • Observed structures at potential node sites showed inverted, inwardly jointed internode tube ends.

Related Experiment Videos

  • Electron microscopy confirmed the absence of typical node structures in intact nerves.

    • Conclusions:

    • Nodes of Ranvier are artifacts, not intrinsic structures of living nerve fibers.
    • The observed jointed structures are formed by external stimuli like thermal or chemical effects.
    • Re-evaluation of nerve fiber morphology in its native state is crucial.