Fig. 1.

Characteristics of corpus callosal TH+ axons. A–A” Computational confocal sections indicate that TH+ axons do not demonstrate a clear topographical organization (arrowheads indicate branching sites). B TH+ axons make perisomatic terminations (arrowheads indicate branching sites, arrows indicate perisomatic terminations). C, C’ TH+ axons align with rows of nuclei (arrowheads indicate branching sites, arrows indicate nuclei). D Multiple TH+ axons converge onto single cells (arrow). E, E’ TH+ axons adjoin striatal and cortical regions across the dorso-ventral axis (different axons identified by arrows of different colors, arrowheads indicate branching sites)