. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. 4-2 COMPARATIVE ANATOMY Amphibia.—The vertebral column of Urodeles may be differ- entiated into cervical, thoraco-lumbar, sacral, and caudal regions, and these regions can be recognised, except in certain modified forms, in all the higher Vertebrates. On account of the absence of extremities in Csecilians, the vertebral column can only be. Fig. 31.—Tail of Lepidosteus. -divided into three regions—cervical, thoracic, and a very short caudal. In Anura, no special lumbar region can be recognised, and the caudal portion is
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative. 4-2 COMPARATIVE ANATOMY Amphibia.—The vertebral column of Urodeles may be differ- entiated into cervical, thoraco-lumbar, sacral, and caudal regions, and these regions can be recognised, except in certain modified forms, in all the higher Vertebrates. On account of the absence of extremities in Csecilians, the vertebral column can only be. Fig. 31.—Tail of Lepidosteus. -divided into three regions—cervical, thoracic, and a very short caudal. In Anura, no special lumbar region can be recognised, and the caudal portion is modified to form a urostyle (see pp. 41 and 44). The centra of the Amphibia, as well as those of the Amniota, correspond to arch-centra (see p. 39).. 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, William Newton, 1857-1923. London, Macmillan
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