. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. EfEEji>—Ventral Septum' A B C Fig. 456. Diagrams of the three patterns of rib arrangement. A, elasmo- branch with dorsal ribs; b, ganoid with both dorsal and ventral (haemal) ribs; c, teleost with haemal ribs only. (After Coppert.) The short ribs of urodeles are forked at their proximal ends like a letter Y, thus having two points of attachment to the vertebra (Fig. 457), in that way forming a passage-way between the fork and the vertebra, called the ve
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. EfEEji>—Ventral Septum' A B C Fig. 456. Diagrams of the three patterns of rib arrangement. A, elasmo- branch with dorsal ribs; b, ganoid with both dorsal and ventral (haemal) ribs; c, teleost with haemal ribs only. (After Coppert.) The short ribs of urodeles are forked at their proximal ends like a letter Y, thus having two points of attachment to the vertebra (Fig. 457), in that way forming a passage-way between the fork and the vertebra, called the vertebrarterial canal. A simi- Diapophysis ^^2*. -»-Neural Canal Parapophysis. Tuberculum / Capituium lar canal persists in mammals and even in man, where one branch of the fork becomes the "head" and the other the "tu- bercle" of the rib (Figs. 451 and 458), thus preventing the large vertebral artery that lies therein from being disturbed when the neck is stretched or twisted about. The ribs of the Anurans are not forked, and become small immovable tips attached to the transverse processes of the vertebrae. Among reptiles the ribs found in lizards and crocodiles are most typical, becoming differentiated into a dorsal bony vertebral division, homologous Notochora* Fig. 457. A vertebra with a pair of ribs (in black) of a young salamander, showing the primitive double articulation of ribs to verte- brae. (After Gegenbaur.). 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
