Histological defects in the cerebellum of adult lurcher (Lc) mice.

The adult cerebellum of the heterozygous lurcher mouse (Lc/+) shows severe defects which affect particularly the Purkinje cells and granule cells. The cytoarchitecture of the cerebellar cortex is disturbed, and the granular and molecular layers are poorly defined. The population of Purkinje cells is depleted, except for a few large neurons scattered in the granular layer and white matter. Although a discrete Purkinje cell layer does not exist, pyridine-silver preparations reveal a row of arborizing basket cell axons and climbing fiber terminals which suggests the site previously occupied by Purkinje cell bodies. Granule cells are also affected and are distributed throughout the molecular layer, granular layer, and white matter.