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