Figure 3.

Interdigitating systems. (A) Tangential section through monkey primary visual cortex, reacted for cytochrome oxidase (CO). Obvious patches correspond to thalamocortical terminations. (B) Adjacent section reacted for synaptic zinc, where patches correspond to a subset of corticocortical terminations. The top of the photo is cut tangential through layer 4A. The zinc-positive patches are complementary to the CO-patches in layer 3 (see arrows), and layer 4A. (C) Coronal section through the posterior orbitofrontal cortex of macaque, where MAP2 immunohistochemistry reveals distinct clusters of apical dendrites at the border of layers 1 and 2. These are likely to co-localize with zinc-positive terminations. (D) Higher magnification of C, where three dendritic clusters are indicated by arrowheads. (C) and (D) are modified from Figure 3 of Ichinohe and Rockland (2004). Scale bar in (C) = 1.0 mm, 160 μm for (D), and 600μm for (A) and (B).