Fig. 5 in Growth and life habits of the Triassic cynodont Trirachodon, inferred from bone histology

Fig. 5. The bone histology of a Trirachodon radius and ulna, from a single individual (CGP1/79). A. Radius (CGP1/79a), note the annuli containing parallel−fibered tissue and the LAG at the periphery of the bone (arrowhead). Vascularization decreases towards the periphery. Remodeling has occurred as is evident from the resorption cavities in the peri−medullary cavity. Scale bar 250 µm. B. Ulna (CGP1/79b), the tissue consists of moderately vascularized fibro−lamellar tissue, which is interrupted by annuli (arrowheads). Secondary osteons are scattered throughout the cortex (white arrow). MC indicates medullary cavity. Scale bar 125 µm.