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. 2016 Mar 23;6:23327. doi: 10.1038/srep23327

Figure 1. Direct, hyperdirect and indirect pathways of the basal ganglia.

Figure 1

(a) Anatomical (left) and (b) schematic (right) representations of a sensorimotor striato-thalamo-cortical circuit highlighting the presence of the major pathways and the way they contribute to the gain in the neural circuit. Thal = thalamus; GPi = globus pallidus pars interna; GPe = globus pallidus pars externa; STN = subthalamic nucleus; SNr = Subtantia Nigra pars Reticulata. Str (D1) and (D2) represent the areas of the striatum characterised by high concentration of either D1 or D2 receptors.