By Tom Rea
Tom Rea strains the evolution of medical idea relating to dinosaurs and divulges the deception, hostility, and infrequently outright aggression found in the early years of fossil hunting. This e-book information some of the most famous—and notorious—dinosaur skeletons ever found: Diplodocus carnegii, named after Andrew Carnegie.
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Extra resources for Bone Wars: The Excavation Of Andrew Carnegie's Dinosaur
1. 12. The V-2 cranial nerve facial opening for (A) Tyrannosaurus, BHI 3033, lies at the suture between the maxilla and premaxilla. 1, it lies caudal to the maxilla-premaxillary suture and is completely bounded by the maxilla. 32 Peter Larson Tooth morphology Bakker et al. ” Illustrating isolated maxillary teeth referred to Nanotyrannus and Tyrannosaurus, Bakker et al. demonstrated a clear difference in cross section between the two genera (see Fig. 13). For this study I measured the length and width of the fourth maxillary tooth at the base of the crown for a number of taxa.
11). ” This opening, called the subnarialis foramen by Carr (1999) and Brochu (2003), is here considered to be the maxillary exit for cranial nerve V-2. The V-2 cranial nerve (the second branch of the fifth cranial or trigeminal nerve) is the superior maxillary nerve and is the sensory nerve for the upper lip and cheeks in humans (Gray 1901). In Tyrannosaurus rex this nerve exits at the junction of, and is equally bounded by, the maxilla and premaxilla (see Fig. 12A). This is also the case in Allosaurus (Madsen 1976).
Clearly pneumatic features like pneumatopores and pneumatic fossae can develop early in ontogeny in avian theropods. But how early did these features manifest themselves in birds’ theropod ancestors? Even as unhatched embryos, theropods show the marks of the diverticula of the respiratory system. Pneumatopores in the vertebrae can be present even at this early stage of development (pers. ; see Fig. 17). 1’s post-orbital sports a deep central depression, or fossa. This fossa has a clear boundary and may represent the impression of diverticula of the respiratory system.