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Medical Definition of Sharpey's fiber. : any of the thready processes of the periosteum that penetrate the tissue of the superficial lamellae of bones.
In contrast with A and B fibers, C fibers have the smallest diameter (.4mm to 1.3mm), conduction (.5-2.3m/sec) and are unmyelinated. The two types of C fibers are Dorsal root and Sympathetic. 1. Dorsal root fibers serve the modality of pain, warm and cold temperature, and touch. 2.The sympathetic type involves postganglionic sympathetic fibers. The pain produced by C fibers is characterizized as dull, often poorly localized and slower onset.he two types of C fibers are Dorsal root and Sympathetic. 1. Dorsal root fibers serve the modality of pain, warm and cold temperature, and touch. 2. The sympathetic type involves postganglionic sympathetic fibers. The pain produced by C fibers is characterizized as dull, often poorly localized and slower onset.