<prompt> Which of the following are unmyelinated nerve fibers?Proprioceptive fibersMotor neuron to musclePostganglionic sympathetic fibersMotor nerve to intrafusal fibers  <response>: Ans. is c i.e., Postganglionic sympathetic fibersRef Ganong 24he p. 92; Principles of medical physiology p. 5I2lType C fibers are unmyelinated fibers which include postganglionic autonomic fibers, 