Differential distribution of spinocerebellar fiber terminals within the lobules of the cerebellar anterior lobe in the cat: an anterograde WGA-HRP study.

The main termination field of spinocerebellar fibers in the anterior lobe was studied using anterograde transport of WGA-HRP in the cat. The C1 to C4 segments project to a midline region of the basal part of lobules I to V. The T3 and T4 or the T4 to T7 segments project mainly within a distance of 1.0 mm lateral to the midline in the middle part of lobules I to V whereas the L2 and L3 segments project mainly to a zone extending from 1.0 mm to 2.0 mm lateral to the midline in the middle part of these lobules. The L7 to Ca3 segments project to a zone extending from 1.0 mm to 2.0 mm lateral to the midline in the apical part of the lobules. The results indicate that the folium of the cerebellar anterior lobe is functionally differentiated from the medial to lateral part and from the apical to the basal part.