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Boyer diss 2009 1046..

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Figure 4.12. Surface reconstructions of the distal row of carpal bones of Plesiadapis<br />

cookei (UM 87990) based on HRxCT data [HRxCT resolution = 0.018 mm (cubic<br />

voxels)]. A, right trapezium and trapezoid. Articular surfaces are illustrated with gray<br />

shading and labeled with numbers: 1 – scaphoid facet, 2 – MC I facet, 3-3’ –<br />

corresponding facets of trapezoid and trapezium, 4 – MC II facet, and 5 – capitate and/or<br />

centrale facet. B1, scaphoid (Sc), trapezium (Trm), and trapezoid (Trd) articulated and<br />

oriented in several views with respect to idealized anatomical planes of the trapezium<br />

(i.e., as used in Fig. 4.11). B2, same bones as in “B1” articulated and oriented in several<br />

views with respect to idealized anatomical planes of the trapezoid (i.e., as used in Fig.<br />

4.11). Note the wide separation between the facets for MC I and MC II. MC I and MC II<br />

did not contact one another in the articulated hand.<br />

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