Similarities between the laminar organization and horizontal connections of olfactory cortex and hippocampus. Abbreviations: 1. OB, olfactory bulb; AOC, anterior olfactory cortex; APCV, ventral anterior piriform cortex; APCD, dorsal anterior piriform cortex; PPC, posterior piriform cortex; sup, superficial. 2. EC, entorhinal cortex; DG, dentate gyrus; prox, proximal; dist, distal; SL-M, stratum lacunosum- moleculare; SR, stratum radiatum; sup, superior; SP, stratum pyramidale; SO, stratum oriens. From Neville and Haberly (2004).