Type of fiber | Size (diameter) | Myelinated | velocity range (ms) | Transmitted information |
---|---|---|---|---|
A-fiber | Large (5-20 μm) | Yes | >4.5 | Afferent visceral information and efferent motor signals |
B-fiber | Mid-size (1-3 μm) | Yes | 2-4.5 | Most of the efferent parasympathetic signals |
C-fiber | Small (0.4-2 μm) | Yes | <2 | Mainly afferent visceral information |