. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. VERTEBRAL COLUMN 59 The greatest number of vertebrae is seen in Snakes, in which there may be over 400. Birds.—The vertebral column of Birds has many points of resemblance with that of Reptiles both phylogenetically and onto- genetically. In both groups the notochord usually eventually disappears entirely, and the whole skeleton becomes strongly ossified. Archffiopteryx, as well as the Cretaceous Ichthyornis, possessed biconcave vertebrae, but in existing adult Birds this character never occurs except in the free caudal v
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. VERTEBRAL COLUMN 59 The greatest number of vertebrae is seen in Snakes, in which there may be over 400. Birds.—The vertebral column of Birds has many points of resemblance with that of Reptiles both phylogenetically and onto- genetically. In both groups the notochord usually eventually disappears entirely, and the whole skeleton becomes strongly ossified. Archffiopteryx, as well as the Cretaceous Ichthyornis, possessed biconcave vertebrae, but in existing adult Birds this character never occurs except in the free caudal vertebrae. Cervical, thoracic, lumbar, sacral, and caudal regions can be distin- guished. The arches always become united into a single mass with the corresponding centra, not remaining separated from them by sutures, as is the case in certain Reptiles: even the ligament which keeps the odontoid process of the axis in its place may. 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 Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, Macmillan and co. , limited
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