<prompt> Which of the following fibers reach Purkinje cells directly?Vestibular nucleiInferior olivary nucleusRaphe nucleusLocus coeruleus  <response>: Ans. B. Inferior olivary nucleus Only fibers reaching Purkinje cells directly in the outer molecular layer are climbing fibers originating from inferior olivary nucleus of medulla oblongata constituting olivocerebellar and para olivocerebellar tract. Rest all other tracts are called Mossy fibers. 