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Different sensory receptors are innervated by different types of sensory neurons. 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.
Type | Erlanger-Gasser Classification |
DiameteSensory fiber typesr | Myelin | Conduction velocity | Associated sensory receptors |
---|---|---|---|---|---|
Ia | Aα | 13-20 µm | Yes | 80–120 m/s | Primary receptors of muscle spindle |
Ib | Aα | 13-20 µm | Yes | 80–120 m/s | Golgi tendon organ |
II | Aβ | 6-12 µm | Yes | 33–75 m/s | Secondary receptors of muscle spindle All cutaneous mechanoreceptors |
III | Aδ | 1-5 µm | Thin | 3–30 m/s | Free nerve endings of touch and pressure Nociceptors of neospinothalamic tract Cold thermoreceptors |
IV | C | 0.2-1.5 µm | No | 0.5-2.0 m/s | Nociceptors of paleospinothalamic tract Warmth receptors |
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