Cellular distribution of PKC immunoreactivity in the flocculus (A, C) and nodulus (B, D). A, PKCδ immunoreactivity in the flocculus was observed in somata and dendrites of many Purkinje cells and in somata of some molecular layer interneurons (open arrows). The immunopositive interneurons were observed in bands along the ventromedial and ventrolateral margins of the flocculus. Erythrocytes are indicated bysmall black arrows. B, PKCδ-immunopositive cells are shown in a tangential section through lobule Xa of the nodulus. Note the intense immunoreactivity of Purkinje cell somata and proximal dendrites. Weakly immunopositive molecular layer interneurons were observed rarely (open arrow).Small black arrows indicate erythrocytes.C, Higher magnification photomicrograph of somatodendritic staining of flocculus Purkinje cells from a band showing no immunopositive molecular layer interneurons.D, High magnification view of PKCα immunopositive Purkinje cells (arrows) from a tangential section through the Purkinje cell layer of lobule Xa. Note the intense immunoreactivity associated with the nuclear region and the weaker reaction in the somata and proximal dendrites.