<prompt> Fastest acting nerve fibers are?AaAbBC  <response>: Ans. is a i.e., AaoType A fibers have maximum velocity because they are thick and myelinated. Among A fibers. Aa have maximum conduction because they are thickest and myelinated.oAmong A fibers conduction velocity is AaAbAgAdoType B fibers have some myelination so they are faster than C fibers and slower than A fibers.oType C fibers have slowest conduction because they are thin and non-myelinated.Classification of Mammalian Nerve fibres Group Erlanger And GasserLloyed HuntMyelinationDiameter micronsConduction velocity msFunctionAgent to which conduction is most susceptible Agent to which conduction is most susceptibleAaIHeavily myelinated13-2070-120 MaximumProprioception Motor supply to Skeletal muscle extrafusal to muscle spindlePressureAbIIMyelinated4-1325-70Touch, kinesthetic sense, pressurePressureAg-Slighdy myelinated3-615-30Motor supply to intrafusal muscle fibres muscle spindlePressureAdIIISome myelinated1-55-30Pain, temperature, pressure, touchPressureB-Some myelinated1-33-14Preganglionic autonomic fibresHypoxiaCIVUnmyelinated0.2-1.00.2-2 MinimumPain, temperature, postganglionic autonomic fibresLocal anaesthetics Local anaesthetics 