Figure 2.

The envelope and density of the dendritic tree is independent of the proximity to pinwheel centers. A, Z-projection of a traced somato-dendritic tree (Fig. 1, neuron 1) located close to a pinwheel center (red dot). B, Envelope (convex hull) of the dendritic tree shown in A. The center corresponds to the position of the soma. The circularity index is the ratio of the envelope area (gray) to the disc area (white), and is equal to 0.48 for this neuron. C, Circularity index as a function of the distance between soma and pinwheel center. D, Angular distribution of dendritic length in 30° wedges around the soma (same neuron as in A). The uniformity index is equal to 1 minus the coefficient of variation of dendritic lengths across bins and equals 0.70 for this neuron. E, Uniformity index as a function of the distance between soma and pinwheel center.