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Virchows Archiv A

, Volume 375, Issue 1, pp 13–22 | Cite as

Target-targetoid phenomenon of the human muscle fibers

A histological, histochemical and ultrastructural study
  • S. Yagishita
  • Y. Itoh
Article

Summary

Target and targetoid fibers in a muscle biopsy from a patient with paralysis of the deltoid and supraspinatus muscles were studied by light and electron microscopy. The probable cause of the neuropathy was tumor compression.

Target and targetoid change was exclusively confined to hypertrophic or normal-sized fibers. Morphometric evaluation of the target and targetoid fibers showed no significant difference between them. With the electron microscope, up to 4 structural zones were seen in the typical target fiber but many were devoid of either zone 2 (halo) or zone 3, or both.

It was conceivable that focal irregularity and streaming of Z-bands were the primary alterations in the process of target-targetoid fiber formation, and that this phenomenon was induced both by partial residual innervation as well as re-innervation.

Key words

Target-targetoid phenomenon Histochemistry Electron microscopy Z-band alteration Incomplete innervation 

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Copyright information

© Springer-Verlag 1977

Authors and Affiliations

  • S. Yagishita
    • 1
  • Y. Itoh
    • 1
  1. 1.Pathological DivisionKanagawa Rehabilitation CenterKanagawaJapan

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