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Cortico-Basal Ganglia-Thalamo-Cortical Loop, Globus Pallidus Externus…

- - - - Striatum
        
        Caudate Nucleus
        (cognitive)
        
        Putamen
        (Motor)
        
        Direct Step TWO
        GABA from Striatum inactivates the GPi
        GPi can no longer inhibit Thalamus
        
        Globus Pallidus Internus
        
        Direct Step THREE
        GABA from Striatum prevents Gpi from inhibiting the Thalamus
        
        INdirect Step E
        STN activates GPi which inhibits Thalamus thereby preventing movement
        This is is ALSO done TONICALLY without DA
        
        Thalamus
        
        Direct Step FOUR
        With GPi turned off the
        Thalamus can now Initiate Movement
        
        1 more item...
        
        INDIRECT STEP F
        Activation of GPi by STN inhibits Thalamus
        Movement is Prevented
        
        INdirect Step B
        Striatum release GABA on GpE