The cerebellar nucleo-cortical projection in the rat studied by the retrograde fluorescent double-labelling method

Injection of true blue into rat cerebellar cortex and nuclear yellow into either the superior cerebellar peduncle or the ventral thalamus produced double-labelled neurones in the cerebellar deep nuclei. This suggests that the nucleo-cortical projection arises from collaterals of cerebellofugal fibres. The topography of this projection, and differences in collateralization between thalamic and other cerebellofugal fibres are discussed.