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Projections edit
The pars reticulata does not simply send projection to the 'motor' thalamus, which in turn would project to the cortex, although this is one of its anatomical targets. There is evidence that SNpr output also projects to pre-frontal cortical areas, specifically 9m and 9l (which also receive output from GPi) and 46v, 12l, and area TE (inferotemporal cortex).
See Middleton and Strick, 2000.
Merge proposal edit
No, as they are two very distinctive brain regions and separation of articles only emphasizes that. As it has been 2 years since last statement in the discussion, I have removed the merge statement. See substantia nigra --TamCaP (talk) 21:31, 17 May 2011 (UTC)