Fig. 8.

Summary of intrinsic and extrinsic cortical connections of superficial pyramidal cells in PPC. Each SP cell (numbered circles) has an extensively branching axon that contacts a large number of other SP cells in piriform cortex at disparate locations (flat end bars are synapses). Axons from each cell also arborize in adjoining cortical areas, including those involved in the highest order brain functions. Axonal branches from each cell extend to most, but not all of the target areas (e.g., cell 1 projects to all areas with the exception of amygdaloid cortex; cell 2 does not project to the olfactory bulb or perirhinal cortex). Reciprocal projections from target areas are indicated by arrows. Connections with cortical areas in the olfactory peduncle are not illustrated.