Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 VERTEBRAL COLUMN. 39 Amphibia.—The vertebral column of Urodeles may be divided into cervical, thoraco-lumbar, sacral, and caudal regions, and these regions can be recognised, except in certain modified forms such as Snakes, from Urodeles up to the Mam- malia. On account of the absence of extremities in Chilians, the vertebral column can only be divided into three regions, cervical, FIG. 29.'—TAIL OF Protopterus. thoracic, and a very short caudal. In Anura, no special lum

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Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 VERTEBRAL COLUMN. 39 Amphibia.—The vertebral column of Urodeles may be divided into cervical, thoraco-lumbar, sacral, and caudal regions, and these regions can be recognised, except in certain modified forms such as Snakes, from Urodeles up to the Mam- malia. On account of the absence of extremities in Chilians, the vertebral column can only be divided into three regions, cervical, FIG. 29.'—TAIL OF Protopterus. 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 p. 42). The notochord of Urodele Iarva3, like that of most Fishes, undergoes vertebral constrictions, while intervertebrally it grows thicker, and accordingly appears expanded. Thus the vertebrae here

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