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C fiber

Unmyelinated fibers 1 um in diameter. Slow conduction: 1 meter/second. Includes: 1) sensory fibers: - nociceptor (pain) signals (except skin), temperature sensation. - C-fibers bifurcate upon entering the spinal cord with branches of these axons ascending & descending for a few segments of part of the tract of Lissauer, while axon collaterals synapse on stalk cell interneurons in layer II of the dorsal horn of the spinal cord (substantia gelatinosa) - C-fibers release glutamate in addition to substance P 2) autonomic postganglionic fibers

Specific

postganglionic fiber

General

nerve fiber

References

  1. Principles of Neural Science, 3rd ed., Kandel, Schwartz & Jessell (eds), Elsevier, NY, 1991, pg 388-90
  2. Stedman's Medical Dictionary 27th ed, Williams & Wilkins, Baltimore, 1999