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Boyer diss 2009 1046..

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Figure 4.37. Surface reconstruction of distal tarsals of Plesiadapis cookei (UM 87990)<br />

based on HRxCT data [HRxCT resolution = 0.018 mm (cubic voxels)]. Articular areas<br />

shown in gray and labeled with numbers: 1 – navicular articular facet of mesocuneiform<br />

(Msc), 2 – ectocuneiform (Ect) facet, 3 – entocuneiform facet, 4a-d – cuboid (Cb), 5 –<br />

navicular facet of ectocuneiform, 6 – mesocuneiform facet, 7 – calcaneum facet, 8 –<br />

astragalus facet, 9 – navicular facet, and 10a-d – ectocuneiform facets of cuboid.<br />

Abbreviation: Pltg – peroneus longus tendon groove. Facet 4a typically contacts 10b. 4b<br />

seems to only engage 10a when the ectocuneiform is shifted proximally or dorsally<br />

relative to the cuboid. 4c contacts 10a when the bones are positioned as shown in the<br />

figure. 4d contacts 10c-d.<br />

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