Narrow band-shaped longitudinal olivocerebellar projection connects corresponding rostral and caudal aldolase C compartments. A, Photomicrographs of several coronal sections showing that the narrow band of the distribution of labeled climbing fibers (asterisks) is parallel with and belongs to an aldolase C compartment. The brackets in each panel indicate positive compartments. All labeled climbing fibers were located in the medial portion of rostral compartment 1- or caudal compartment 1-, hereafter classified as 1-(med)//1- (see Results). B, C, Photomicrograph (B) and plot of the injection site in the inferior olive (C; horizontal representation of the left inferior olive) (the same experiment as shown in A). D, Distribution of all labeled climbing fibers in the experiment shown in A (red) and three other experiments (green, blue, violet) plotted in an unfolded representation of the cerebellar cortex. The colored squares indicate locations of individual labeled climbing fibers. The colored circles indicate the approximate areas of the photographs in A, E, F, and G. The dotted transverse line indicates the rostrocaudal boundary. E-G, Photomicrographs of double staining of aldolase C and climbing fibers in the three experiments plotted in green, blue, and violet in D. Labeled climbing fibers are indicated by circles, the colors of which correspond to those in D. The injection sites of these experiments were located in the lateral subnucleus b of the caudal part of the MAO (c-MAO; E), the rostral subnucleus b of the c-MAO (F), and the rostral part of the MAO (r-MAO; G). I-X, Lobules I-X; a-c, sublobules a-c; CP, copula pyramidis; Sim, simple lobule.