Fig. 3 | Nature Communications

Fig. 3

From: Medullary bone in an Early Cretaceous enantiornithine bird and discussion regarding its identification in fossils

Fig. 3

Osteohistology of the tibiotarsus of pengornithid IVPP V15576. a Full cross-section; b close up under polarized light; c close up of the longitudinal canal near the periosteal surface (black arrow) indicating active growth; d close up showing radial vascular canals and spicular trabeculae of the MB. Scale bar in a equals 500 µm; scale bar in b equals 200 µm; scale bars in c and d equal 100 µm

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