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Basic circuit of the mammalian hippocampus and dentate fascia. Abbreviations: Alv, alveus; perf, perforant pathway; CA1, CA3: regions of the hippocampus; DF, dentate fascia; P, pyramidal cell; B, basket cell; Gr, granule cell; mf, mossy fiber; Sc, Schaffer collateral. Arrows indicate direction of flow of activity. Open profiles: excitatory synaptic action; filled profiles: inhibitory synaptic action. From Shepherd (1974).
