Acta Neuropathologica

, Volume 44, Issue 2, pp 91–102 | Cite as

Ultrastructural sequence of myelin degradation

I. Wallerian degeneration in the rat optic nerve
  • H. Lassmann
  • H. P. Ammerer
  • W. Kulnig
Original Works

Summary

The ultrastructural events in myelin degradation in the rat optic nerve following transection have been studied. Myelin debris was found in cells similar to multipotential glia cells (Vaughn and Peters, 1968) as well as in astrocytes and in few oligodendrocytes. The different types of inclusions found during myelin degradation were described in their quantitative relations. Similarities to inclusions described in adrenoleukodystrophy and multiple sclerosis are discussed. By comparison of the ultrastructural findings with histochemical and biochemical data available a hypothetical model of myelin degradation is presented. The process starts with the degradation of digestible proteins resulting in uniformly layered lipid inclusions. Lipid degradation leads to the formation of unstructured lipid droplets and crystals. During the late stages of Wallerian degeneration numerous polymorph inclusion types can be found, probably representing poorly digestible lipids or lipoproteins.

Key words

Myclin degradation Wallerian degeneration Optic nerve Electron microscopy 

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Copyright information

© Springer-Verlag 1978

Authors and Affiliations

  • H. Lassmann
    • 1
    • 2
  • H. P. Ammerer
    • 1
    • 2
  • W. Kulnig
    • 1
    • 2
  1. 1.Neurologisches Institut der Universität WienWienAustria
  2. 2.Neurochirurgische Abteilung der Rudolfstiftung und Institut für Mikromorphologie und Elektronenmikroskopie der Universität WienWienAustria

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