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. 2011 Oct 13;369(1952):3785–3801. doi: 10.1098/rsta.2011.0080

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This journal is © 2011 The Royal Society

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 2. — (a) Before (top) and after (bottom) pruning. (b) The bold edge between p₁ and p₂ is replaced by a vertex between p₀ and p₃. (c) If edge 1–2 is removed, triangles 2–3–4 and 1–4–3 collapse. The shaded region is replaced by the 1–2–3 triangle; or (d) a lifted one. (e) Cortical surface before (left) and after (right) pruning to a minimum edge length of 2.5 mm.