Fig. 4 in Ontogenetic stages of ceratopsian dinosaur Psittacosaurus in bone histology

Fig. 4. Bone microstructure in juvenile ceratopsian dinosaur Psittacosaurus lujiatunensis Zhou, Gao, Fox, and Chen, 2006 from western Liaoning, China, Early Cretaceous. Mid-diaphyseal transverse section of right humerus (IVPP V14341.1, A), right radius (IVPP V14341.6, B), left tibia (IVPP V14341.5, C). Endosteal bone (arrow) showing in the inner most cortex and medullary cavity of right ulna (IVPP V14341.6, D), right radius (IVPP V14341.6, E), right femur (IVPP V14341.1, F), right fibula (IVPP V14341.1, G). Sharpey's fibres (arrows) in left tibia (IVPP V14341.5, H). Photographs in regular transmitted light (A1–C1, H1), elliptically polarized light (A2–C2, D, E, F, G, H2), line drawings (A3–C3) showing longitudinal vascular canals (navy), reticular vascular canals (green), radial vascular canals (red), and LAGs (brown lines). Abbreviation: ec, erosion cavity.