The role of the hippocampus in memory storage in the mammalian brain has been examined in depth.Previous studies show a differential effect of dorsal and ventral hippocampus lesions on various some operant tasks. Which predicts the non homogeneous structure of hippocampus and it can be predicted that hippocampus may have differential role in storing memory. So to examine the effects of discrete hippocampal lesions present study was carried out on navigational ability of rats by using water maze paradigm.

The detailed analysis of the behavioral performance of each lesioned group in present study provided some insight into the nature and the magnitude of the deficits after hippocampal lesions.