The mammalian nerve fibers are divided into 3 groups,A,B,C.
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 Local anaesthetics
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