Cerebellar projections to the red nucleus of the cat.

The organization of cerebello-rubral projections in the cat was studied after injection of Diamidino yellow and/or horseradish peroxidase into the red nucleus (RN). The nucleus interpositus posterior projects to the rostral RN and the nucleus interpositus anterior to the caudal RN. In each case only sparse retrograde labeling was observed in the nucleus lateralis. These projection zones do not correspond with the organization of rubrospinal projections.