Researchers map four new brainareas involved in many cognitive processes
Figure 6B
). It was characterized by visible but thin layers II and IV, with layer IV displaying more fuzzy borders with adjacent layers III and V in comparison to SFS1. Like Fp1 and MFG1, BA9 layer III showed a gradient in cell body size with medium-sized to large neurons in deeper layer IIIc. The main cytoarchitectonic differences to area SFS1 were the generally lower cell density, which was especially low in layer IV, large pyramidal cells in layer Va, and a pale layer Vb.
. The main distinction of BA9 was a thin and blurred layer IV and large pyramidal cells in layer Va compared to area MFG1. Typical for BA46 was the prominent layer IV. Layer III had a slight gradient in pyramidal cell size, and infragranular layers were more prominent than in area MFG2. Arrowheads indicate these borders.
Ventrally to MFG2, a further yet unmapped area spanning the rising aspect of the sulcus was identified, which seems to correspond to parts of BA46 . Compared to MFG2, this area had no homogenous appearance as the cell body size increased slightly across layer IIIa to layer IIIc. Further, the area showed a thin layer II with a diffuse transition to layer III.
. Each area is represented by a set of 20 dots and an ellipsoid, indicating the centroid for each area. The variance in the localization of the dots reflects the cytoarchitectonic intersubject variability. Area MFG1 and area SFS2 can be separated from the areas SFS1 and MFG2 . The dendrogram of the hierarchical cluster analysis
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