FIGURE 2.

Axonal arborization of EZ and IZ neurons in rat cerebral cortex and striatum. The axons of both EZ and IZ neurons were distributed widely in motor-associated areas; the axon fibers of EZ neurons preferred middle cortical layers, L3–L5, as their target layers (A,B,E–G), whereas those of IZ neurons were mainly (>50%) distributed in L1 (C,D,H–K). In addition, IZ neurons but not EZ neurons sent a considerable amount of axon collaterals to the striatum. The results are schematically summarized in (L). Modified with permission from Figures 5,6, and 9 of Kuramoto et al. (2009). Scale bar in (C) applies to (A,C); that in (D) to (B,D); and those in (F,I) to (F,G,I–K).