Figure 5

Photomicrographs of lesions of the hippocampus. Lesions of the hippocampus: photomicrographs of sections ~4.7 mm posterior to bregma, stained with cresyl violet. (a) Sham-operated rat, dorsal hippocampus, right hemisphere (medial to the left). CA1, cornu ammonis field 1; CA3, cornu ammonis field 3; DG, dentate gyrus; cc, corpus callosum; PtA, parietal association cortex. (b) Hippocampal-lesioned rat; same area as (a). There is tissue collapse within the lesion and the ventricle is greatly expanded. (c) Sham-operated rat, ventral hippocampus. AHiPM, amygdalohippocampal area, posteromedial part; cp, cerebral peduncle. (d) Hippocampal-lesioned rat, same area as (c). (e) Coronal diagram of the rat brain at 4.8 mm posterior to bregma [114], with scale. The upper grey box indicates approximately the region shown in (a) and (b); the lower grey box indicates approximately the region shown in (c) and (d).