Table 1.

Classification of nerve fibers.

Nerve fiber	Diameter	Myelination	Conduction velocity	Afferent or	Type
classification	(μm)		(m/s)	Efferent
Aα	13–20	Thick	80–120	Both	Sensory
					and Motor
Aβ	6–12	Medium	33–75	Both	Sensory
					and Motor
Aγ	5–8	Medium	4–24	Efferent	Motor
Aδ	1–5	Thin	3–30	Afferent	Sensory
B	<3	Thin	3–14	Afferent	Autonomic
C	0.2–1.5	None	0.5–2	Afferent	Sensory
					and Motor

Adapted from Fix and Brueckner (2009).