Abstract
Electrophysiological studies of the lateral septal region were performed on acutely prepared cats. The data indicate that the lateral septal region consists of two functionally distinct zones: a dorsal zone (i.e., dorsal septal nucleus) and a ventral zone (i.e., lateral septal nucleus). The dorsal septal nucleus receives a heavy ipsilateral fimbria projection, but receives no projection via the ventral septal afferent system. There is no return projection through the fimbria. Test responses recorded from the dorsal septal nucleus show prolonged periods of suppression. The lateral septal nucleus receives a lesser share of the ipsilateral fimbria input, but does receive input via the ventral septal afferent system. Convergence upon single cells between ipsilateral fimbria and ventral septal afferent input was an outstanding feature of lateral septal nucleus organization. Cells in the lateral septal nucleus project out of the lateral septal region in both dorsal and ventral directions.
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