They show a relatively high intersubject variability in volume and position. The delineated areas were superimposed in the anatomical MNI space, and probabilistic maps were calculated. Area hOc4d was identified rostral to hOc3d it differed from the latter by larger pyramidal cells in lower layer III, thinner layers V and VI, and a sharp cortex-white-matter borderline.
The larger area, hOc3d, is located dorso-lateral to area V2 in the region of superior and transverse occipital, as well as parieto-occipital sulci. They occupy the medial and, to a smaller extent, lateral surface of the occipital lobe. Two previously unknown cytoarchitectonic areas (hOc3d, hOc4d) were detected. The cortex adjacent to Brodmann area 18/V2 was therefore analyzed in serial sections of ten human post-mortem brains using morphometrical and multivariate statistical analyses for the definition of areal borders. The dorsal visual stream consists of several functionally specialized areas, but most of their cytoarchitectonic correlates have not yet been identified in the human brain.
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