Template:Peripheral Nerve Fibres: Difference between revisions
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| Aฮณ ย || Yes ย || 4-8 ย || 15-40 || Touch, pressure, and gamma motor neurons. | | Aฮณ ย || Yes ย || 4-8 ย || 15-40 || Touch, pressure, and gamma motor neurons. | ||
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| Aฮด (III)ย || Thin || 1-5ย || 5-30 || " | | Aฮด (III)ย || Thin || 1-5ย || 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). | ||
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| Bย || No || 1-3ย || 3-14 || preganglionic autonomic | | Bย || No || 1-3ย || 3-14 || preganglionic autonomic | ||
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| C (IV) || No || 0.2-1.5 || 0.5-2.0 || "second" pain, mechanical, chemical, thermal, pruritis, and postganglionic autonomic. | | C (IV) || No || 0.2-1.5 || 0.5-2.0 || "second" pain, mechanical, chemical, thermal, pruritis, and postganglionic autonomic. polymodal | ||
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Revision as of 06:45, 19 August 2021
- Characteristics of peripheral nerve fibres
| Nerve Fibre | Myelin | Diameter (ยตm) | Conduction velocity (m/s) | General Function |
|---|---|---|---|---|
| Aฮฑ (I) | Yes | 13-20 | 80-120 | muscle spindle primary endings, golgi tendon organs, touch, 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 |
