The Order in Synaptic Circuits of the C erebral Cortex : Lessons from the Hippocampus

Neuronal diversity in the cerebral cortex has fascinated scientis ts fo r more than a hundred years, but a basic circuit accounting for interconnections of the existing neuronal types in the cortex is still missing. T he structural and functional relationships among cortical cells and their sub cortical inputs was a major interest of Otto Creutzfeldt and his associates, who pioneered many approaches for the elucidation of visual cortical cir cui try in fUllctional In a symposium in his honor it is most appropriate to provide a brief summary of recent insights into synaptic relationships of cortical neurons.