The fibre pathways associated with the basal ganglia include through-conduction lines and side-loops associated with the striatum, pallidum and substantia nigra. Each of these regions is now known to contain subdivisions differing from one another in the neurotransmitter-related compounds they contain. This paper includes an outline of these new findings and a commentary on some of their functional implications.
        
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Graybiel AM (1984) Neurochemically specified subsystems in the basal ganglia Ciba Found Symp107: 114-49