Fig. 2 | Nature Communications

Fig. 2

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

Fig. 2

Osteohistology of the femur of pengornithid IVPP V15576. a Full cross-section under normal light; b cross-section under polarized light; c LAG in femur approached by endosteal resorption; d close up of the osteocyte lacunae in the cortical bone compared to the larger and more irregular osteocyte lacunae in the medullary bone; e close up of region preserving vascular sinuses and a structure interpreted as a trabecula. Anatomical abbreviations: cb, cortical bone; il, intermuscular line; LAG, line of arrested growth; mb, medullary bone; ol, osteocyte lacunae; rl, resorption line; vc, vascular canal; vs, vascular sinus; ts, trabecular strut. Scale bar for a and b is 500 µm; scale bar for d is 50 µm; scale bar for e is 200 µm

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