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Striatum
GABAergic
GABAergic
GABAergic
glutamatergic
glutamatergic
(dis-inhibitory)
(dis-inhibitory)
(inhibitory)
Externalglobuspallidus  Â
from cortex
Internal globus pallidusÂ
Subthalamic nucleus
GABAergic
(inhibitory)
GABAergic
(dis-dis-inhibitory)
GABAergic
(dis-inhibitory)
dopaminergic
Substantia nigra
pars reticularis
pars compacta
back to cortex
Thalamus
– direct pathway
– indirect pathway
– indirect pathway
dopaminergic
(excitatory)
glutamatergic
(excitatory)
(dis-dis-dis-inhibitory)
(excitatory)