. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. 534 Biology of the Vertebrates synsacrum. Beyond this region there are several separate caudal vertebrae followed usually by a pygostyie formed by the fusion of the last few caudals. In mammals the cervical vertebrae typically number seven, whether the neck is functionally absent, as in the whales where the cervical vertebrae are all fused together, or conspicously present, as in the bizarre, long-necked giraffes. ^-Odontoid Process •Atlas. Centrum of Axis
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. 534 Biology of the Vertebrates synsacrum. Beyond this region there are several separate caudal vertebrae followed usually by a pygostyie formed by the fusion of the last few caudals. In mammals the cervical vertebrae typically number seven, whether the neck is functionally absent, as in the whales where the cervical vertebrae are all fused together, or conspicously present, as in the bizarre, long-necked giraffes. ^-Odontoid Process •Atlas. Centrum of Axis Fig. 440. The human atlas and axis, ventral view. (After Sobotta and McMurrich.) There are four known exceptions to this rule of seven: the three-toed sloth, Brady pus, has nine cervical vertebrae; the ant-bear, Tamandua, eight; while the two-toed sloth, Choloepus, and the American sea cow, Trichechus, each has six. As in reptiles and birds, the first two cervical vertebrae of mammals are further specialized into the so-called atlas and the axis (Fig. 440). The atlas, according to Vesalius, takes its name from human anatomy, since in man it "bears the weight of the world" upon its shoulders in the form of the head, -Neural Arch. 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 Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
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