Three-dimensional display of lobar regions.

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Three-dimensional display of lobar regions. Three-dimensional display of lobar regions. The regions are shaded in order of decreasing darkness from frontal to temporal, parietal, and occipital lobes. Coronal images indicate brain landmarks for distinguishing parietal from occipital and frontal-temporal from parietal lobes. All supratemporal structures anterior to the aqueduct of Sylvius were considered frontal. Temporal lobe volume was traced from the anterior pole of the temporal lobe to the aqueduct of Sylvius. The superior-medial temporal lobe boundary was defined as a straight line drawn from the angle of the medial temporal lobe, where it attaches to the temporal stem, to the midpoint of the operculum. The dura of the middle cranial fossa was then traced around each temporal lobe to complete the temporal lobe region. The parietal lobes were defined as posterior to the aqueduct of Sylvius, extending to the medial transverse fissure of the striate cortex. Occipital cortex was the remaining caudal portion of the hemispheres. Daniel H. Geschwind et al. PNAS 2002;99:5:3176-3181 ©2002 by National Academy of Sciences