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Template:POTD/2012-01-07

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Basal ganglia
The main circuits of the basal ganglia, a group of nuclei in the brains of vertebrates that act as a cohesive functional unit. Shown here are two coronal slices that have been superimposed to include the involved basal ganglia structures. + and − signs at the point of the arrows indicate respectively whether the pathway is excitatory or inhibitory in effect.
  Excitatory glutamatergic pathways
  Inhibitory GABAergic pathways
  Dopaminergic pathways that are excitatory on the direct pathway and inhibitory on the indirect pathway
Image: Mikael Häggström