Electrophysiological analysis of the trigemino-tecto-olivo-cerebellar (crus II) projection in the rat.

In albino rats the whisker area was electrically stimulated while climbing fiber responses were surveyed in the cerebellar cortex of the tecto-olivo-recipient zone in the medial region of crus II. Climbing fiber responses were evoked by the vibrissal stimulation only in the medial portion of the zone. Based both on lesion experiments of the superior colliculus and on recording multiunit potentials in the inferior olive it is suggested that the trigeminal climbing fiber responses are evoked via the superior colliculus.