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Schematic diagram of the major central olfactory pathway (based on references Gottfried 2006; Bitter et al. 2011). Regions in gray represent the primary and secondary olfactory cortex. The PC is the major part of the primary olfactory cortex. The secondary olfactory cortex mainly includes OFC, IC, ACC, and thalamus. Projections between the secondary olfactory cortex subregions are reciprocal.
