Fig. 6 in An Older and Exceptionally Large Adult Specimen of Tyrannosaurus rex

Fig. 6. Osteohistology of the right fibula of RSM P2523.8. A, Outer cortical microstructure viewed using incident light microscopy. Note the plethora of secondary osteons indicating dense haversian bone remodeling (HB) and the closely packed remnants of lines of arrested growth (LAGS) nearest the periosteal surface of the element. B, Deep cortical dense haversian remodeling viewed using polarized petrographic microscopy. C, Unorganized, globular and porous, medullar-like bone tissue architecture near the lateral surface of the element. Arrows indicate the borders of secondary osteons (SO), many of which are partially or completely eroded. D, Wedl tunnels created by fungal erosion (FE) associated with the medullar-like bone tissue.