Anatomy

Unmyelinated Nerve Fibers

A class of nerve fibers as defined by their nerve sheath arrangement. The AXONS of the unmyelinated nerve fibers are small in diameter and usually several are surrounded by a single MYELIN SHEATH. They conduct low-velocity impulses, and represent the majority of peripheral sensory and autonomic fibers, but are also found in the BRAIN and SPINAL CORD.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

A class of nerve fibers as defined by their nerve sheath arrangement. The AXONS of the unmyelinated nerve fibers are small in diameter and usually several are surrounded by a single MYELIN SHEATH. They conduct low-velocity impulses, and represent the majority of peripheral sensory and autonomic fibers, but are also found in the BRAIN and SPINAL CORD.

MeSH Record

Classification

Broader headings

Related Concepts

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MeSH Record

See Also

MeSH Record

Synonyms

5 entry terms
  • Nerve Fibers, Unmyelinated
  • Nerve Fiber, Unmyelinated
  • Unmyelinated Nerve Fiber
  • C Fibers
  • C Fiber

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

2003; for C FIBERS use NERVE FIBERS 1977-2002

MeSH Record

Previous Indexing

  • Nerve Fibers (1976-2002)

MeSH Hierarchy

Tree Numbers

  1. A08w.675w.542w.756
  2. A11w.671w.501w.756

AMA Style

References

  1. National Library of Medicine. Unmyelinated Nerve Fibers. Medical Subject Headings (MeSH). 2026. Unique ID D036421. http://id.nlm.nih.gov/mesh/2026/D036421
  2. Unmyelinated Nerve Fibers. In: Wikidata. https://www.wikidata.org/wiki/Q66501951