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Unmyelinated nerve

Definition

noun

A nerve that is bare or without the myelin sheath around the axon.


Supplement

The unmyelinated nerve pertains to any of the nerve cells without myelin sheath (a sheath involved in the rapid conduction of action potential). Compared to myelinated nerves, unmyelinated nerve cells are slower in conducting impulses and are found in the peripheral nervous system (especially visceral nervous system) and the gray matter of the nervous system.


Word origin: un- (not) + myelinated

Synonym:

Compare: myelinated nerve

See also: myelin


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The Physics of how the Myelin Sheath actually works.

Hm, well in an unmyelinated nerve cell, the ions propagate through diffusion, not through a current, correct? Why is it different here? ...

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by Nebulae
Sun Feb 24, 2008 9:03 am
 
Forum: Human Biology
Topic: The Physics of how the Myelin Sheath actually works.
Replies: 17
Views: 20860

The Fiber Disease

... by some form of electrical stimilus.. from .7 to 2.3 m/sec.....in unmyelinated now consider from the above article: A 1 (conduction velocity ... of "mixed" fibers, containing myelinated and unmyelinated nerve fibers (4–2 m/sec), conducting excitation in response to both types ...

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by Skytroll
Wed Oct 25, 2006 4:44 am
 
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 5425703

The Fiber Disease

... stretch receptors of joints and muscles (stance). There are specific nerve receptors for this form of perception, just as there are specific receptors ... 31 January 1975 Abstract Afferent activity in thin myelinated and unmyelinated cutaneous nerve fibers was analyzed by an impulse collision ...

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by Skytroll
Wed Oct 25, 2006 4:28 am
 
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 5425703

The Fiber Disease

London, Okay so what is a C-fiber? C fiber n. Any of the unmyelinated fibers, 0.4 to 1.2 micrometers in diameter, conducting nerve impulses at a velocity of 0.7 to 2.3 meters per second. http://medical-dictionary.thefreedictionary.com/C+fiber ...

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by Skytroll
Wed Oct 25, 2006 3:14 am
 
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 5425703

The Fiber Disease

... inflammation of the skin is induced by the activation of nociceptive nerve fibres followed by vasodilation and an increase in vascular permeability. Nociceptors belong to the group of unmyelinated (C-fibre) or myelinated (A-fibre) sensory nerve fibres that innervate ...

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by Skytroll
Sun Sep 03, 2006 6:37 pm
 
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 5425703


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