<prompt> Nerve fibers involved in proprioceptionType A fiberType B fiberType C fiberType IV fiber  <response>: Ans. a Type A fiberRef: Ganong, 25th edp.94Erlanger and Gasser classified nerve fibers in to three types A, B and C based on their diameter, degree of myelination and conduction velocities.The classification is for both sensory and motor nerve fibers. The classification is as follows,Fiber TypeMyelin Present or AbsentDiameterumConduction Velocity msFunctionsA aMyelinated12-20 Largest70-120 HighestProprioception; somatic motorA bMyelinated5-1230-70Touch, pressureA gMyelinated3-615-30Motor to muscle spindlesA dMyelinated2-512-30Pain, temperatureBMyelinated33-15Preganglionic autonomicC, dorsal rootUnmyelinated0.4-1.2 Smallest0.5-2 lowestPain, temperatureC, SympatheticUnmyelinated0.3-1.30.7-2.3Postganglionic sympathetic 