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Characteristics of Primary Afferent Fibers
| AB fibers | Aδ-fibers | C fibers | |
|---|---|---|---|
| Diameter | Large | Small | Smallest |
| Conduction velocity | Very Fast | Fast | Slow |
| Myelination | Heavily myelinated | Lightly myelin | Unmyelinated |
| Stimulus Sensation Function |
Non-noxious Light touch Proprioception Mechanoreceptor |
Noxious, rapid Mechanical and thermal Acute, sharp pain Nociception |
Noxious, slow Polymodal (chemical, mechanical, thermal) Dull, aching pain Nociception |
