. L'anatomie comparée des animaux domestiques. Anatomie vétérinaire. Le FCETUS. 915 de sa partie antérieure printemps deux branches, les arcs aortiques (arcus aortce), qui sont dirigés vers la tête de l'embryon, et sont ensuite en- haut vers le bas et vers l'arrière. Ils sont associés pour constituer le seul l'aorte, qui, dans sa tnrn^ se divise en deux arterice vertehralis trunks, le aortce ou primitive. Ces navires passent le long de la surface inférieure de l'embryon, parallèles les uns aux autres, et fournir durant leurs cours quatre ou cinq divisions, le ompJialo-artères mésentériques, qui rami

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. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE FCETUS. 915 From its anterior part spring two branches, the aortic arches (arcus aortce), which are directed towards the head of the embryo, and are afterwards in- flected downwards and backwards. They join together to constitute the single aorta, which, in its tnrn^ divides into two trunks, the arterice vertehralis or primitive aortce. These vessels pass along the lower surface of the embryo, parallel to each other, and furnish during their course four or five divisions, the ompJialo-mesenteric arteries, which ramify in the area germinativa, and open into a limitary vein named the sinus (or vena) terminalis. From the network of the area and the sinus arise two vessels, the vence omphalo- mesentericce, which enter the posterior extremity of the heart. The circulation in the umbilical vesicle is somewhat ephemeral in several species, and it has been already stated that the vesicle is atrophied at an early period of fcBtal life. In birds it is most extensive ; and its presence may be noted in the Carnivora during the whole term of uterine existence. 2. Development of the Heaet and Vessels.—Placental Circulation.— The heart which, until now, was a cylindrical tube, is considerably modified before it attains its complete development. In its different phases, it successively offers all the forms known to exist in vertebrate animals. The first change consists in an inflexion; the tube curves in an S manner, so Fi^. 441.. 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 work.. Chauveau, Auguste, 1827-1917; Arloing, Saturnin, 1846-1911; Fleming, George, 1833-1901. tr. New York. D. Appleton and company

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