. Bulletin. Natural history; Natuurlijke historie. OSTEOLOGY OF DEINONYCHUS ANTIRRHOPUS B 47. FIG. 29. Fourth (?) cervical vertebra of Deinonychus antirrhopus, YPM 5204, in posterior (A), left lateral (B), anterior (C) and dorsal (D) views. Notice the strong angling of the centrum and the curved zygapophyseal facets. Abbreviations: dp—diapophysis; ep—epipophysis; li—scars of interspinous ligament; ns—neural spine; pi—pleurocoel; po—postzygapophysis; pp—parapo- physis; pr—prezygapophysis. vertebra (Fig. 30), from a larger individual, was recovered from a different section of the Yale quarry app
. Bulletin. Natural history; Natuurlijke historie. OSTEOLOGY OF DEINONYCHUS ANTIRRHOPUS B 47. FIG. 29. Fourth (?) cervical vertebra of Deinonychus antirrhopus, YPM 5204, in posterior (A), left lateral (B), anterior (C) and dorsal (D) views. Notice the strong angling of the centrum and the curved zygapophyseal facets. Abbreviations: dp—diapophysis; ep—epipophysis; li—scars of interspinous ligament; ns—neural spine; pi—pleurocoel; po—postzygapophysis; pp—parapo- physis; pr—prezygapophysis. vertebra (Fig. 30), from a larger individual, was recovered from a different section of the Yale quarry approximately 15 inches (38 cm) from the atlas intercentrum (YPM 5210) referred to above. Neither of the first two can be articulated with the axis, so neither can represent the third segment. Comparison with the fragmentary cervicals of AMNH 3015 indicates they probably are the fourth and fifth cervicals. The larger vertebra (YPM 5210) is a more posterior cervical, probably the seventh or eighth. The most conspicuous character of these vertebrae is the pronounced ob- lique angling of the centra (Figs. 29B, SOB and 31). Unlike a conventional vertebra in which the anterior and posterior centrum surfaces are parallel to each other and perpendicular to the long axis of the centrum, these surfaces form angles of 75° to 40° with the long axis (the floor of the neural canal) and are not parallel. Table 3 gives the geometry of known Deinonychus cer- vicals. Similar angling of the post-axial cervicals occurs in both Allosaurus and Cera- tosaurus (Gilmore, 1920: p. 30 and pi. 20) but it is not as strongly developed in either. Gorgosaurus and Tyrannosaurus also exhibit very slight angling of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Peabody Museum of Natural History. New Haven : The Museum
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