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Boyer diss 2009 1046..

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Figure 3.7. Cranium of Plesiadapis cookei (UM 87990) – internal information revealed<br />

by HRxCT data. Top left – cranium reconstruction in dorsal view (perpendicular to slice<br />

orientation, showing position of cross-sections in A and B. Bottom left – cranium rotated<br />

into posterodorsal view. A, Skull reconstruction in posterodorsal view with bone<br />

posterior to first cross section level removed. Enlargement of this cross section shows<br />

sphenoids that have been crushed into the cranium. B, Skull reconstruction in<br />

posterodorsal view with bone posterior to second cross section level removed.<br />

Enlargement of this cross section through orbitotemporal region, close to point of<br />

maximum orbitotemporal constriction, shows onlapping suture of parietal on frontal.<br />

Numbers and abbreviations: 15 – metopic suture, 18 – cross-sectional view of<br />

frontal/parietal contact, 24 – sagittal crest, 31 – basisphenoid entopterygoid process, 32 –<br />

alisphenoid ectopterygoid process, 33 – canal leading to sphenorbital fissure, 34 –<br />

possible vidian canal; Fr – frontal; Pa – parietal.<br />

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