Cerebral Cortex Advance Access originally published online on September 30, 2004
Cerebral Cortex 2005 15(7):913-920; doi:10.1093/cercor/bhh190
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Cerebral Cortex V 15 N 7 © Oxford University Press 2004; all rights reserved
Basal Ganglia and Cerebellar Inputs to ‘AIP’
1 Pittsburgh Veterans Affairs Medical Center, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA, 2 Center for the Neural Basis of Cognition, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA and 3 Departments of Neurobiology, Neurosurgery and Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
Address correspondence to Dr Peter L. Strick, Department of Neurobiology, University of Pittsburgh School of Medicine, W1640 Biomedical Science Tower, 200 Lothrop Street, Pittsburgh, PA 15261, USA. Email: strickp{at}pitt.edu
The anterior intraparietal area (AIP) is a subregion of area 7b in posterior parietal cortex. AIP neurons respond to the sight of objects, as well as to the act of grasping them. We used retrograde transneuronal transport of rabies virus to examine subcortical inputs to AIP in the monkey. Virus transport labeled substantial numbers of neurons in the substantia nigra pars reticulata (SNpr), as well as in the dentate nucleus of the cerebellum. The hotspots of labeled neurons in SNpr and in dentate after AIP injections were separate from those created by virus injections into several other parietal or frontal regions. These observations provide the first evidence that a major output nucleus of the basal ganglia, the SNpr, projects to a region of posterior parietal cortex. In addition, our findings provide further support for the concept that posterior parietal cortex is a target of cerebellar output.
Key Words: basal ganglia • cerebellum • dentate nucleus • posterior parietal cortex • rabies virus • substantia nigra • transneuronal tracing
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