Divergent axon collaterals projection from neurones of the pontine nuclei to the cerebellar paramedian lobule in the rabbit: a fluorescent double labelling study.

To investigate whether neurones of the pontine nuclei (PN) give off collateral projections to the cerebellar paramedian lobule (PML) of both sides, the method of retrograde transport of fluorescent tracers, Fast Blue (FB) and Diamidino Yellow (DY), was employed in the rabbit. Following injections to the various regions of the left (FB) and right (DY) PML cortex, double labelled neurones were found mainly in the dorsolateral nucleus (DL) and peduncular nucleus (PD), and in less number in the paramedian nucleus (PM) and lateral nucleus (L). No double labelling was observed in the ventral nucleus (V).