Which sensation travels faster A - proprioseption B - vibration C - pain D - ich
Proprioception and vibration travel fastest, carried by Aα (Ia/Ib) and Aβ fibers respectively - both large, heavily myelinated axons with conduction velocities of 30-70 m/s (Aβ) up to 70-120 m/s (Aα).
The ranking from fastest to slowest:
| Sensation | Fiber Type | Velocity |
|---|---|---|
| Proprioception | Aα (Ia/Ib) | 70-120 m/s |
| Vibration | Aβ | 30-70 m/s |
| Itch | C fibers (pruriceptors) | 0.5-2 m/s |
| Pain | Aδ (sharp/fast pain) | 5-30 m/s |
| C fibers (slow/burning pain) | 0.5-2 m/s |
Answer: A - Proprioception
Key reasoning:
- Proprioception uses Aα fibers (the largest, most myelinated nerve fibers in the body) - muscle spindle afferents (Ia) and Golgi tendon organ afferents (Ib).
- Vibration uses Aβ fibers - also fast, but slightly smaller than Aα.
- Pain (fast) uses Aδ fibers (thinly myelinated) - the "first pain" or sharp pain you feel immediately.
- Pain (slow/burning) and itch both use unmyelinated C fibers - the slowest of all.
So the correct answer is A - Proprioception, which travels the fastest via Aα fibers at up to 120 m/s.
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