Circuits of the basal ganglia. Picture shows 2 coronal slices that have been superimposed to include the involved basal ganglia structures. + and - signs at the point of the arrows indicate respectively whether the pathway is excitatory or inhibitory in effect. Green arrows refer to excitatory glutamatergic pathways, red arrows refer to inhibitory GABAergic pathways and turquoise arrows refer to dopaminergic pathways that are excitatory on the direct pathway and inhibitory on the indirect pathway. Note that dis-inhibitory pathways in effect are excitatory on the feedback to the cortex, while dis-dis-inhibitory pathways in effect are inhibitory.
See en:Basal ganglia#Connections
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			Thalamus.png (By Patrick J. Lynch; Creative Commons Attribution-Share Alike license)
		
		
			
			Basal ganglia.svg (Based on work by Andrew Gillies/User:Anaru; Creative Commons Attribution ShareAlike + GFDL license)
		
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Introduction to Parkinson's Disease By Zaneta Navratilova. Last updated: May 10, 2004. Modified from Nestler et. al, 2001, p. 306 and Ottley et. al, 1999.
eMedicine &gt; Parkinson Disease: Multimedia Author: Robert A Hauser. Coauthor(s): Rajesh Pahwa, Kelly E Lyons, Theresa McClain. Updated: Apr 27, 2010
Mikael Häggström, based on images by Andrew Gillies/User:Anaru and Patrick J. Lynch