Figure 6 in The paleohistology of bone and teeth in Cretaceous Pycnodontidae (Neopterygii: Pycnodontiformes): the case of Neoproscinetes penalvai and Tepexichthys aranguthyorum

Figure 6. – Neoproscinetes penalvai. (MNHN-F-Histos 2727) Visceral bone (transmitted natural light). A: A view of bone organization showing a lot of vascular canals or cavities (Vc). One can see numerous osteoblastic canalicles more or less orthogonal to the various bone surfaces; they are sinuous and ramified. B: Another bone area organization showing a lot of primary and a secondary (white asterisk) vascular canals. Secondary bone is crossed by osteoblastic canalicles. One can see numerous osteoblastic canalicles some of which are ramified (black arrow-head). C: Detail of a primary vascular canal (Vc) with radial osteoblastic canalicles and osteocytes lacunae (black arrow-heads). D: Detail of osteocytic lacunae (black arrow-heads) with their thin ramified cellular processes. E: Detail of two osteoblastic canalicles showing their apical ramifications (black arrows). F: Detail of a bone with cementing lines (black arrow-heads) indicating remodelling process. The white arrowheads point to Howship lacunae indicating an osteoclastic resorbing activity. G: Detail of the secondary osteone pointed by a white asterisk in figure 6B. It shows i) the apertures of osteoblastic canalicles (white arrowheads); ii) the reversal cementing line (black arrowheads) of the secondary osteone (OII); iii) a multiramified osteoblastic canalicle (black arrow) starting from the surface of a primary osteone (OI). Scale bars: A = 200 μm; B, C, F = 50 μm; D, E = 20 μm; G = 10 μm.