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Detailed connections between the PPTg and basal ganglia. The basal ganglia forms several internal circuits. The PPTg have reciprocal connections with the subthalamic nucleus (STN), internal globus pallidus (GPi) and substantia nigra pars reticulata (SNr). The PPTg also projects to the external globus pallidus (GPe), substantia nigra pars compacta (SNc) and centromedian nucleus (CM).
