Fig. 3 in Bone histology of the graviportal dinocephalian therapsid Jonkeria from the middle Permian Tapinocephalus Assemblage Zone of the Karoo Basin of South Africa

Fig. 3. Transverse sections of the tarsal (SAM-PK-12233c) of Jonkeria parva (Boonstra, 1955) from the middle Permian Tapinocephalus Assemblage Zone of the Karoo Basin of South Africa. A1, diaphyseal cross-section showing highly vascularized fibrolamellar bone tissue in the outer cortex and cancellous bone tissue with extensively developed bony trabeculae in the medullary cavity; note: numerous enlarged resorption cavities in the perimedullary region. A2, detail showing highly vascularized reticular FLB. A3, A4, detail showing simple longitudinal vascular canals. A5, A6, detail showing reticular vascular canals. Photographs under cross-polarized light with lambda compensator (A1–A3, A5) and ordinary light (A4, A6).