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Chapter 9 - Pathology

Published online by Cambridge University Press:  14 September 2023

John A. Jarratt
Affiliation:
Emeritus, Sheffield Teaching Hospitals NHS Foundation Trust
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Summary

Muscle disease tends to be patchy, hence the term ‘sampling’, which is often applied to the technique of electromyographic investigation. The susceptibility of muscle pathology to electromyographic diagnosis relies on type 1 fibres being affected because motor units containing these fibres are the first to be recruited. Myelinated nerve fibres may undergo demyelination or degeneration depending upon whether the myelin or the axon is primarily affected. Severely demyelinated nerves are unstable and degenerate. Disease of nerve cell bodies cause centripetal degeneration in the longest axons, the so-called dying-back neuropathy. Severe trauma to a nerve causes distal degeneration, also known as Wallerian degeneration.

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Publisher: Cambridge University Press
Print publication year: 2023

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  • Pathology
  • John A. Jarratt, Emeritus, Sheffield Teaching Hospitals NHS Foundation Trust
  • Book: Essential Electromyography
  • Online publication: 14 September 2023
  • Chapter DOI: https://doi.org/10.1017/9781009381055.010
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  • Pathology
  • John A. Jarratt, Emeritus, Sheffield Teaching Hospitals NHS Foundation Trust
  • Book: Essential Electromyography
  • Online publication: 14 September 2023
  • Chapter DOI: https://doi.org/10.1017/9781009381055.010
Available formats
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Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Pathology
  • John A. Jarratt, Emeritus, Sheffield Teaching Hospitals NHS Foundation Trust
  • Book: Essential Electromyography
  • Online publication: 14 September 2023
  • Chapter DOI: https://doi.org/10.1017/9781009381055.010
Available formats
×