Template:Peripheral Nerve Fibres: Difference between revisions
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! Nerve Fibre !! Myelin !! Diameter (ยตm) !! Conduction velocity (m/s) !! General Function | ! Nerve Fibre !! Myelin !! Diameter (ยตm) !! Conduction velocity (m/s) !! General Function | ||
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| Aฮฑ (I) || Yes ย || 13-20 ย || 80-120 || muscle spindle primary endings, golgi tendon organs | | Aฮฑ (I) || Yes ย || 13-20 ย || 80-120 || Proprioception: muscle spindle primary endings (Ia), golgi tendon organs (Ib), and alpha motor neurons ย | ||
|- | |- | ||
| Aฮฒ (II) ย || Yes ย || 6-12 ย || 35-75 || Discriminative sensitivity to mechanical stimuli (touch, vibration), pain modulation (block nociceptive information, allodynia in sensitisation) | | Aฮฒ (II) ย || Yes ย || 6-12 ย || 35-75 || Discriminative sensitivity to mechanical stimuli (touch, vibration), pain modulation (block nociceptive information, allodynia in sensitisation) | ||
Revision as of 19:42, 3 September 2021
- Characteristics of peripheral nerve fibres
| Nerve Fibre | Myelin | Diameter (ยตm) | Conduction velocity (m/s) | General Function |
|---|---|---|---|---|
| Aฮฑ (I) | Yes | 13-20 | 80-120 | Proprioception: muscle spindle primary endings (Ia), golgi tendon organs (Ib), and alpha motor neurons |
| Aฮฒ (II) | Yes | 6-12 | 35-75 | Discriminative sensitivity to mechanical stimuli (touch, vibration), pain modulation (block nociceptive information, allodynia in sensitisation) |
| Aฮณ | Yes | 4-8 | 15-40 | Touch, pressure, and gamma motor neurons. |
| Aฮด (III) | Thin | 1-5 | 5-30 | "rapid" pain, crude touch, pressure, temperature. AMH type I for rapid mechanical pain (high heat threshold >53C), AMH type II for rapid heat pain (lower heat threshold 43-47C). |
| B | No | 1-3 | 3-14 | preganglionic autonomic |
| C (IV) | No | 0.2-1.5 | 0.5-2.0 | "second" pain, mechanical, chemical, thermal, pruritis, and postganglionic autonomic. polymodal |
