Group A nerve fibers are most susceptible to: (A) Pressure, (B) Hypoxia, (C) Local anaesthetics, (D) Temperature
Answer is A. Pressure on a nerve can cause loss of conduction in large diameter motor,touch& pressure fibre ( ie group A fibre) ,while pain sensation (group c fibre) remains relatively intact. Ref: Ganong&;s Review of medical physiology;25th edition; pg: 95.