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Fig. 3 | Frontiers in Zoology

Fig. 3

From: Trabecular architecture in the forelimb epiphyses of extant xenarthrans (Mammalia)

Fig. 3

Main direction of the trabeculae (MDT) in regions of interest (ROIs) located in the epiphyses of the forelimb of xenarthrans. Stereographic projections of the MDT colour-coded according to the lifestyle categories for each ROI, namely the glenoid cavity (a), humeral head (b), humeral capitulum (c), radial head (d), and radial trochlea (e). The projections are on the lower hemisphere, which corresponds to the distal direction (symbolised on the upper left legend by a crossed circle). The smaller dots represent specimens for which the degree of anisotropy (DA) is below 0.5, greater values being represented by the larger dots. Three-dimensional (3D) renderings of the relevant bones (right bones seen in lateral view for the scapula and anterior view for the humerus and radius) indicate the location of the ROIs and the perspective of the projections (‘eye symbol’). The anatomical orientations (‘Anterior’, ‘Medial’, and ‘Distal’) are only valid for the stereographic projections (not for the 3D renderings). On the upper left smaller projection (used to indicate the anatomical direction) are labelled the pairs of coordinates that define the 3D vectors (azimuth; plunge), except for the centre (perfect distal orientation) for which the azimuth is irrelevant. The p-values indicate the significance of the difference among functional categories (ANOVA for spherical data)

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