Review
Anatomy of the dopamine system in the basal ganglia

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The dopaminergic nigropallidal and nigrosubthalamic projections control the activity of the globus pallidus and subthalamic nucleus neurons in both normal and pathological conditions. Intrastriatal dopaminergic neurons increase substantially in animal models of Parkinson's disease. They contain GABA, display the ultrastructural features of interneurons and form axo-axonic synapses with putative cortical-like glutamatergic boutons. The local dendritic release of dopamine by neurons in the substantia nigra pars compacta and ventral tegmental also influences basal ganglia functions. Thus, the long-term belief that the effects of dopamine in the basal ganglia were solely mediated through the nigrostriatal system must be changed to take into account extrastriatal dopaminergic projections and intrastriatal dopaminergic neurons.

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