RESUMO
The projections of the hippocampus onto the cerebral cortex were studied in 31 rats after injections of horseradish peroxidase(HRP) into the parietal, frontal, and temporal lobes of the cerebral cortex respectively. The results were as follows:1) HRP labelled pyramidal cells were found in the CA1~CA3 of the dorsal and ventral hippocampus on both sides, more numerous on the ipsi-lateral side in all the cases. However, no HRP labelled cells could be identified in the CA4 or dentate gyrus in any case.2) Labelled neusons of hippocampo-temporal projection were more numerous than those of hippocampo-parietal or hippocampo-frontal projection. However, no difference could be revealed between those of hippocampo-parietal and hippocampo-frontal projections.The anatomical and functional significance of our findings were discussed