. Bulletin. Natural history; Natuurlijke historie. OSTEOLOGY OF DEINONYCHUS ANTIRRHOPUS 49 TABLE 3. Morphology of the cervical vertebrae of Deinonychus antirrhopus and Felis leo (attitude of centra faces relative to the floor of the neural canal) ANTERIOR CENTRUM FACE POSTERIOR CENTRUM FACE D. antirrhopus F. leo D. antirrhopus F. leo YPM 5204 YPMOC YPM 5204 YPMOC Vertebra number YPM 5210 1050 YPM 5210 1050 Atlas — — Axis — — 75° 80° 3 ? 58° ? 63° 4 51° 55° 58° 58° 5 41° 58» 58° 61° 6 ? 65° ? 65° 7 45° 75° 73° 70° 8 ? — ? — 9 ? — ? — First dorsal 85° 80° 85° 85° Mid-dorsal 90° 85° 89° 85°. FIG.
. Bulletin. Natural history; Natuurlijke historie. OSTEOLOGY OF DEINONYCHUS ANTIRRHOPUS 49 TABLE 3. Morphology of the cervical vertebrae of Deinonychus antirrhopus and Felis leo (attitude of centra faces relative to the floor of the neural canal) ANTERIOR CENTRUM FACE POSTERIOR CENTRUM FACE D. antirrhopus F. leo D. antirrhopus F. leo YPM 5204 YPMOC YPM 5204 YPMOC Vertebra number YPM 5210 1050 YPM 5210 1050 Atlas — — Axis — — 75° 80° 3 ? 58° ? 63° 4 51° 55° 58° 58° 5 41° 58» 58° 61° 6 ? 65° ? 65° 7 45° 75° 73° 70° 8 ? — ? — 9 ? — ? — First dorsal 85° 80° 85° 85° Mid-dorsal 90° 85° 89° 85°. FIG. 31. Reconstruction of the cervical flexure in Deinonychus antirrhopus, based on the sharply angled centra of mid-cervical vertebrae. Stippled elements are represented by near perfect ver- tebrae in the Yale collections. Abbreviations: ax—axis; cd—"; {Felis leo) and tiger (F. tigris). I believe comparable natural curvature was present in the cervical series of all theropods (see fig. 18 in Gilmore, 1920, for an excellent example), but it may have reached a maximum in Deinonychus. The geometry of lion cervicals is given, along with that of Deinonychus, in Table 3. The lion's neck arches up at an angle of 50° to 60° to the trend of the anterior thoracics, as a consequence of this cervical angling. The more extreme degree of centrum distortion in Deinonychus, suggests that this cervical series fwas held at an even greater angle to the dorsal series than is found in the lion. Cervical curvature could be increased, of course, by contraction of the dorsal cervical 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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