A Functionally Important Feature of the Distribution of the Olivo–Cerebellar Climbing Fibers

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Abstract
The olivo–cerebellar projection has been demonstrated by injections of small volumes of tritiated l-leucine in the inferior olive. A strictly contralateral projection to the cerebellar cortex has been found. Labelling of terminal fibers in the molecular layer is restricted to the paravermian and lateral regions of cortex after an injection of the central region of the olive. The distribution presents a very striking feature: the label is distributed along sagittal bands about 0.4 mm wide interrupted by empty spaces of the same width. It is suggested that an extra-olivary source provides the climbing fibers distributed in these spaces.