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. Author manuscript; available in PMC: 2009 Mar 2.
Published in final edited form as: Neuroimage. 2005 Sep 6;29(2):452–466. doi: 10.1016/j.neuroimage.2005.07.048

Figure 5.

Figure 5

Horizontal sections show the progressive differentiation of PCC in the rostrocaudal direction. The prominent ventral branch of the spls (vb) is shown in this section and areas d23a, d23b, v23b, and 31 are present. Notice that retrosplenial area 29 is cut with a glancing section at this level and no cytoarchitecture can be differentiated and the level of area 23a is quite dorsal and starting to merge with area 23b and the thickness of layer Va is increased. The highest magnification photographs were aligned on the layer IV/Va border and the other two borders emphasize the striking elaboration of layers IV and Va. Although each panel is a separate photograph, arrows are oriented to mark layer borders so the progressive differentiation of different layers can be compared and appreciated. For example, follow the progressive increase in width and neuron density of layer IV from the left to right of the figure.