THE CEREBELLAR NUCLEOCORTICAL PROJECTIONS IN THE RAT - A RETROGRADE LABELING STUDY USING HORSERADISH-PEROXIDASE COMBINED TO A LECTIN

Following injections of wheat germ agglutinin-horseradish peroxidase conjugate in the cerebellar cortex of adult rats, retrograde cellular labelling was of the two kinds within the cerebellar deep nucler (i) of high intensity, in those nuclear regions that also showed anterograde terminal labelling, this topographically arranged nucleocortical projection has therefore been called ''reciprocal''. ''Reciprocal'' projections to zone A. to the zones C1 and C2, and to zone D come from the nucleus medialis, the interposed nuclear complex, and the nucleus lateralis, respectively; (ii) of low intensity, in nuclear areas surrounding the previous ones. No nucleocortical projections could be evidenced to either the B or the C3 zones.