. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. The Skeleton 543 articular facets by means of which the rib plays upon its vertebral support, maintaining its attachment with a minimum of muscular equipment. Along the inner margin of each rib, for a part of its length at least, is a shallow groove, the sulcus, within the protection of which a vein, or artery, and a nerve lie parallel to each other in harmonious safety. There are normally twelve pairs of ribs in man (Fig. 452), although much evidence from
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. The Skeleton 543 articular facets by means of which the rib plays upon its vertebral support, maintaining its attachment with a minimum of muscular equipment. Along the inner margin of each rib, for a part of its length at least, is a shallow groove, the sulcus, within the protection of which a vein, or artery, and a nerve lie parallel to each other in harmonious safety. There are normally twelve pairs of ribs in man (Fig. 452), although much evidence from comparative anatomy, as well as from embryology, supports the conclusion that the ancestors of modern man had more. That reduction in the length of ribs is going on is indicated by their obvious degeneration in the posterior region of the thoracic basket, where at least two pairs fail to reach the sternum. Neck .Sulcus. Attachment o| Cartilage.' Fig. 451. The fifth right bony rib of man, as seen from below. (After Cunningham.). 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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Keywords: ., bookcentury1900, booksubjectanatomycomparative, booksubjectverte
