Peripheral nerves

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  1. Ia, A-alpha
    1. diamter 22 um; conduction velocity 120 m/sec; motor – used in proprioception and large alpha motor neurons
  2. Ib, A-alpha
    1. diameter 22 um; conduction velocity 120 m/sec; sensory – Golgi tendon organs, touch and pressure receptors
  3. II, A-beta
    1. diameter 13 um; conduction velocity 70 m/sec; sensory – muscle spindles, crude touch, pressure, Pacinian corpuscles, Meissner, Merkel
  4. II, A-gamma
    1. diameter 8 um; conduction velocity 40 m/sec; motor – gamma motor neurons
  5. III, A-delta
    1. diameter 5 um; conduction velocity 15 m/sec; sensory – small, minimal myelin, fine touch, pressure, sharp, pricking pain and temperature
  6. III, Beta
    1. diameter 3 um; conduction velocity 14 m/sec; small, minimal myelination preganglionic autonomic fibers
  7. IV, C
    1. diameter 1 um; conduction velocity 2 m/sec; motor; all post-ganglionic autonomic
    2. unmyelinated, pain and temperature fibers of the spinothalamic tract
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