Cerebellum at the level of cerebellar linguae, dog. Hematoxylin and eosin. Figure 15. Dorsal cerebellar hemisphere folium, control, 26 months old. Adequate Purkinje cell density. Figure 16. Mucopolysaccharidosis (MPS) IIIB, dorsal cerebellar hemisphere folium, 26 months old. Severe reduction in Purkinje cell density. Figure 17. Dorsal vermis, control dog, 26 months old. Adequate Purkinje cell density. Figure 18. MPS IIIB, dorsal vermis, 26 months old. Severe reduction in Purkinje cell density.