Erlanger Gasser classification of nerve fibres

  1. Mammalian nerve fibers divided into 3 groups,A,B,C.
  2. Group A fibers are the thickest and Group C fibers the thinnest.

Susceptibility to Pressure,Local anaesthetics and Hypoxia.

From most susceptible to least:

Pressure – ABC

Local anaesthetics-CBA

Hypoxia-BAC.

Mnemonic: ABC PHC

A fibers – Most sensitive to pressure.

B fibers- Most sensitive to hypoxia.

C fibers – Most sensitive to LA.


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