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Cerebral Cortex Advance Access originally published online on May 11, 2005
Cerebral Cortex 2006 16(2):268-279; doi:10.1093/cercor/bhi106
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© The Author 2005. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oupjournals.org

The Human Parietal Operculum. II. Stereotaxic Maps and Correlation with Functional Imaging Results

Simon B. Eickhoff1,2, Katrin Amunts1,3, Hartmut Mohlberg1 and Karl Zilles1,2

1 Institute of Medicine, Research Center Jülich, 52425 Jülich, Germany, 2 C. & O. Vogt-Institute for Brain Research, University of Düsseldorf, 40001 Düsseldorf, Germany and 3 Department of Psychiatry and Psychotherapy, RWTH Aachen University, Germany

Address correspondence to Professor Karl Zilles, Institut für Medizin, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany. Email: K.Zilles{at}fz-juelich.de.

In this study we describe the localization of the cytoarchitectonic subdivisions of the human parietal operculum in stereotaxic space and relate these anatomically defined cortical areas to the location of the functionally defined secondary somatosensory cortex (SII cortex) using a meta-analysis of functional imaging results. The human parietal operculum consists of four distinct cytoarchitectonic areas (OP 1–4) as shown in the preceding publication. The 10 cytoarchitectonically examined brains were 3-D-reconstructed and spatially normalized to the T1-weighted single-subject template of the Montreal Neurological Institute (MNI). A probabilistic map was calculated for each area in this standard stereotaxic space. A cytoarchitectonic summary map of the four cortical areas on the human parietal operculum which combines these probabilistic maps was subsequently computed for the comparison with a meta-analysis of functional locations of SII. The meta-analysis used the results from 57 fMRI and PET studies and allowed the comparison of the functionally defined SII region to the cytoarchitectonic map of the parietal operculum. The functional localization of SII showed a good match to the cytoarchitectonically defined region. Therefore the cytoarchitectonic maps of OP 1–4 of the human parietal operculum can be interpreted as an anatomical correlate of the (functionally defined) human SII region. Our results also suggest that the SII foci reported in functional imaging studies may actually reflect activations in either of its architectonic subregions.

Key Words: human cerebral cortex • meta-analysis • neuroimaging • probabilistic maps • SII • somatosensory cortex


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