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===Substantia nigra=== {{Main|Substantia nigra}} [[File:Blausen 0076 BasalGanglia.png|thumb|Location of the substantia nigra within the basal ganglia]] The substantia nigra is a [[midbrain]] gray matter portion of the basal ganglia that has two parts β the [[pars compacta]] (SNc) and the [[pars reticulata]] (SNr). SNr often works in unison with GPi, and the SNrβGPi complex inhibits the thalamus. Substantia nigra pars compacta (SNc) however, produces the neurotransmitter [[dopamine]], which is very significant in maintaining balance in the striatal pathway. The circuit portion below explains the role and circuit connections of each of the components of the basal ganglia.
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