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Table 2 Roles of A-delta and C fibres in nociception

From: Understanding the nature and mechanism of foot pain

Role A-delta fibres C fibres
Myelination Thinly myelinated Unmyelinated
Neuronal diameter 1 to 5 microns < 1.5 microns
Conduction speed 5–20 metres per second 0.5–2 metres per second
Stimuli Mechanical and sometimes thermal High intensity mechanical, thermal and chemical
Pain sensation Fast Dull, throbbing, aching