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. 2011 Jun 28;6(6):e21422. doi: 10.1371/journal.pone.0021422

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Snively, Theodor.

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 author and source are properly credited.

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Midsagittal sections through the crania of Stegoceras validum, duiker Cephalophus leucogaster, and a bighorn sheep Ovis canadensis reveal similar dome structure. A. In the Stegoceras specimen, compact bone (z1 and z3: zones 1 and 3: [7]) occurs deep and superficial to a cancellous region (z2: zone 2: [7]). Moderately dense compact bone shows as a green band at the base of zone 3 (white line); note cancellous bone (blue) above the line in the anterior portion of this zone. B. Cephalophus. C. Similar stratification is evident in the sectioned Ovis cranium, with nearly identical zones of cancellous and compact bone broken by a ventral sinus.