. Author manuscript; available in PMC: 2015 Apr 24.

Published in final edited form as: Hand Clin. 2013 Aug;29(3):317–330. doi: 10.1016/j.hcl.2013.04.002

Table 1.

Nerve Fiber Types and Properties

Fiber Class	Myelin	Diameter (Mm)	Conduction Velocity (m/s)	Spinal Cord Tract	Location	Function
Aα	+	6-22	30-120	Ipsilateral dorsal column	Efferent to muscles	Motor
Aβ	+	6-22	30-120	Contralateral spinothalamic tract	Afferent from skin and joints	Tactile, proprioception
Aγ	+	3-8	15-35	Ipsilateral dorsal column	Efferent to muscle spindles	Muscle tone
Aδ	+	1-4	5-30	Contralateral spinothalamic tract	Afferent sensory nerves	Pain, cold, temperature, touch
B	+	1-3	3-15	Preganglionic	Preganglionic sympathetic	Various autonomic functions
sC	-	0.3-1.3	0.7-1.3	-	Postganglionic sympathetic	Various autonomic functions
dC	-	0.4-1.2	0.1-2.0	Contralateral spinothalamic tract	Afferent sensory nerves	Various autonomic functions Pain, warm, temperature, touch

Modified from: Berde CB and Strichartz GR. Local Anesthetics. Miller:Miller's Anesthesia, 7^th ed. Lars (eds) Eriksson I, Fleisher LA, Wiener-Kronish JP, Young WL. 2009.

Miner JR, Paris PM, Yealy DM. Pain Management. Mark: Rosen's Emergency Medicine, 7^th ed. (eds) Marx et al. 2010