CA3 lesions impair encoding, While CA1 lesions impair retrieval in the course of Discovering of the Hebb-Williams maze. CA3 efferents during the fimbria had been transected, having care to spare cholinergic and GABAergic afferents. CA1 efferents in the dorsal fornix were equally transected. Fimbria transections, but not dorsal fornix transections,