<prompt> Group B Nerve fibers are situated in:Muscle spindlesFibers carrying pain sensationPreganglionic autonomic fibersPost ganglionic autonomic fibers.  <response>: Ans. is c is Preganglionic autonomic fibres Nerve fiber types in mammalian nerve:Fiber Type AFunctionFiber Diameter mmConduction Velocity msalphaProprioception; somatic motor12-20Max. 70-120betaTouch, pressure5-1230-70gammaMotor to muscle spindles3-615-30deltaPain, cold, touch2-512-30BPreganglionic autonomic33-15C Dorsal rootPain, temperature, some mechanoreceptor, reflex responses0.4-1.20.5-2SympatheticPostganglionic sympathetic0.3-1.30.7-2.3 A and B fibres are myelinated; C fibres are unmyelinated. 