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Types of sensory fibers

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Different sensory receptors are innervated by different types of nerve fibers. Proprioceptors are innervated by type Ia, Ib and II sensory fibers, mechanoreceptors by type II and III sensory fibers and nociceptors and thermoreceptors by type III and IV sensory fibers.

Sensory fiber types
Type Erlanger-Gasser
Classification
Diameter (µm) Myelin Conduction velocity Associated sensory receptors
Ia 13-20 Yes 80–120 m/s Primary receptors of muscle spindle
Ib 13-20 Yes 80–120 m/s Golgi tendon organ
II 6-12 Yes 33–75 m/s Secondary receptors of muscle spindle
All cutaneous mechanoreceptors
III 1-5 Thin 3–30 m/s Free nerve endings of touch and pressure
Nociceptors of neospinothalamic tract
Cold thermoreceptors
IV C 0.2-1.5 No 0.5-2.0 m/s Nociceptors of paleospinothalamic tract
Warmth receptors
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