Substantia nigra
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The substantia nigra (Latin for "black substance", Sömmering) or locus niger is a heterogeneous portion of the midbrain, separating the pes (foot) from the tegmentum (covering), and an accessory to the basal ganglia system.
It consists of two strongly contrasted ensembles, the pars compacta and adjacent dopaminergic groups, and another ensemble made up of the pars reticulata and the pars lateralis. The latter two, along with the pallidal nuclei, are elements of the core of the basal ganglia....
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