The direct (green) and indirect (red) pathways of the basal ganglia, with dopamine projections in blue. NAc, nucleus accumbens; GPe, globus pallidus external segment; GPi, globus pallidus internal segment; VP, ventral pallidum; STN, subthalamic nucleus; SNc, substantia nigra pars compacta; SNr, substantia nigra pars reticulata; VTA, ventral tegmental area. Off-plane nuclei depicted in their approximate ML DV position. The Allen Human Brain Atlas was used as an anatomical reference in creating this figure (Allen Institute for Brain Science, 2010; Ding et al., 2016).