Cerebral Cortex Advance Access originally published online on November 23, 2005
Cerebral Cortex 2006 16(10):1418-1430; doi:10.1093/cercor/bhj079
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Connection Patterns Distinguish 3 Regions of Human Parietal Cortex
1 Department of Experimental Psychology, University of Oxford, South Parks Road, Oxford OX1 3UD, UK and 2 Centre for Functional Magnetic Resonance Imaging of the Brain, Department of Clinical Neurology, University of Oxford, John Radcliffe Hospital, Headley Way, Oxford OX3 9DU, UK
Address correspondence to Matthew Rushworth, Department of Experimental Psychology, South Parks Road, Oxford OX1 3UD, UK. Email: matthew.rushworth{at}psy.ox.ac.uk.
Three regions of the macaque inferior parietal lobule and adjacent lateral intraparietal sulcus (IPS) are distinguished by the relative strengths of their connections with the superior colliculus, parahippocampal gyrus, and ventral premotor cortex. It was hypothesized that connectivity information could therefore be used to identify similar areas in the human parietal cortex using diffusion-weighted imaging and probabilistic tractography. Unusually, the subcortical routes of the 3 projections have been reported in the macaque, so it was possible to compare not only the terminations of connections but also their course. The medial IPS had the highest probability of connection with the superior colliculus. The projection pathway resembled that connecting parietal cortex and superior colliculus in the macaque. The posterior angular gyrus and the adjacent superior occipital gyrus had a high probability of connection with the parahippocampal gyrus. The projection pathway resembled the macaque inferior longitudinal fascicle, which connects these areas. The ventral premotor cortex had a high probability of connection with the supramarginal gyrus and anterior IPS. The connection was mediated by the third branch of the superior longitudinal fascicle, which interconnects similar regions in the macaque. Human parietal areas have anatomical connections resembling those of functionally related macaque parietal areas.
Key Words: anatomical projections • attention • macaque • parahippocampal gyrus • parietal cortex • premotor cortex • superior colliculus
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