Definition
The small fiber neuropathies are a group of disorders of diverse etiologies that have predominant involvement of Aδ and C-fibers, with consequent impairment of nociception, variable degrees of autonomic dysfunction, and frequently neuropathic pain.
Characteristics
The “small fibers” of the PNS include the Aδ and C sensory fibers, the γ efferent fibers, and the preganglionic parasympathetic and postganglionic sympathetic C-fibers. In contrast, the large fibers of the PNS include the Aβ afferents from skin, muscle, and the internal organs, as well as the α motor neurons. Most disorders of the PNS are characterized by distally predominant loss of axons, a process often referred to as distal axonal degeneration or “dying back.” Distal axonal degeneration affects long fibers before shorter ones, with the distal-most regions of the long axons underlying pathologic changes that closely resemble Wallerian degeneration following axonal injury. With time, the process moves proximally...
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Griffin, J.W. (2013). Small Fiber Neuropathies. In: Gebhart, G.F., Schmidt, R.F. (eds) Encyclopedia of Pain. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-28753-4_4033
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DOI: https://doi.org/10.1007/978-3-642-28753-4_4033
Publisher Name: Springer, Berlin, Heidelberg
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