Fig. 3 in Gender-Specific Reproductive Tissue in Ratites and Tyrannosaurus rex

Fig. 3. Dinosaur and ratite MB. (A) MOR 1125, (B) emu, and (C) ostrich demineralized (14) MB. The coloration in (B) and (C) results from infiltration of tissues with blood sinuses. (D) MOR 1125, partially demineralized, showing enlarged, randomly arranged vascular openings surrounded by circumferential matrix fibers. Partially demineralized (E) emu and (F) ostrich medullary tissues show extensive vascular penetration, with randomly spaced and varyingly sized vessel openings. (G) Plane view of undemineralized dinosaur tissues shows fibrous matrix and an unusual pattern of vascular doublets or triplets within osteonlike structures (arrows). The inset shows variation in depth and diameter of vascular sinuses. (H) Undemineralized emu MB shows similar doublet pattern (arrows) and fibrous matrix. The greater depth of field makes focusing difficult. (I) Ostrich MB is denser closer to the cortex (inset), where the doublet/triplet pattern of vessels (arrows) is evident, but this becomes obscured by the increasing development of bony tubes and spicules as bone extends further into the medullary cavity. (J) Plane view of MOR 1125 shows the partially eroded, fibrous MB distributed across the cortex in a mazelike fashion. (K) Emu MB shows white (chloroform-altered) and cream-colored MB in the same mazelike pattern. (L) Thicker, randomly oriented tubular spicules of ostrich MB, showing deep penetration and intimate association of blood-containing sinuses.