Anatomy

Myelinated Nerve Fibers

A class of nerve fibers as defined by their structure, specifically the nerve sheath arrangement. The AXONS of the myelinated nerve fibers are completely encased in a MYELIN SHEATH. They are fibers of relatively large and varied diameters. Their NEURAL CONDUCTION rates are faster than those of the unmyelinated nerve fibers (NERVE FIBERS, UNMYELINATED). Myelinated nerve fibers are present in somatic and autonomic nerves.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

A class of nerve fibers as defined by their structure, specifically the nerve sheath arrangement. The AXONS of the myelinated nerve fibers are completely encased in a MYELIN SHEATH. They are fibers of relatively large and varied diameters. Their NEURAL CONDUCTION rates are faster than those of the unmyelinated nerve fibers (NERVE FIBERS, UNMYELINATED). Myelinated nerve fibers are present in somatic and autonomic nerves.

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See Also

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Synonyms

7 entry terms
  • Nerve Fibers, Myelinated
  • Fiber, Myelinated Nerve
  • Fibers, Myelinated Nerve
  • Myelinated Nerve Fiber
  • Nerve Fiber, Myelinated
  • A Fibers
  • B Fibers

MeSH Record

Aspects Covered

14 allowable subheadings

Indexed with the subheadings chemistry, classification, drug effects, enzymology, immunology, metabolism, microbiology, parasitology, pathology, physiology, radiation effects, transplantation, ultrastructure, virology.

MeSH Record

History Note

1974 (1972); for B FIBERS use AUTONOMIC FIBERS, PREGANGLIONIC 1976-2002

MeSH Record

Previous Indexing

  • Neurons (1966-1971)

MeSH Hierarchy

Tree Numbers

  1. A08w.675w.542w.512
  2. A11w.671w.501w.512
  3. A11w.671w.514

MeSH Record

NLM Classification

WL 102.5

AMA Style

References

  1. National Library of Medicine. Myelinated Nerve Fibers. Medical Subject Headings (MeSH). 2026. Unique ID D009413. http://id.nlm.nih.gov/mesh/2026/D009413
  2. Myelinated Nerve Fibers. In: Wikidata. https://www.wikidata.org/wiki/Q66501949