Organization of ADVR 
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Figure 5. Zone C and zone D neurons are shown as they appear in rapid Golgi preparations. Both popula- 
tions of neurons have a low density of dendritic spines. Zone C neurons have axons which ramify in all 
directions but remain within ADVR. Zone D neurons have axons which either proceed radially into zone 
C or course ventrally across the border of ADVR (dotted line) into the striatum. 
