<prompt> Which group of nerve fibres are least susceptible to LA?A alphaA betaBC  <response>: ANS. DErlanger-Gasser classification of nervesFiber typesFunctionAverage fiber diameters mmAverage conduction velocity msAaPrimary muscle spindle afferents, motor to skeletal muscle15100 70-120ApCutaneous touch and pressure afferents850 30-70AyMotor to muscle spindle52015-30A5Cutaneous temperature and pain afferents31512-30BSympathetic preganglionic373-15CCutaneous pain afferents sympathetic postganglionic11 02-2LA susceptiblity: A deltagammaA betaA alphaBCHypoxia: B A CPressure: A B C 