. The comparative anatomy of the domesticated animals. Veterinary anatomy. TSE FCETUS. 917 tlie anterior cardinal veins; and two posterior, tte posterior cardinal veins. The veins of the same side unite in twos, from which result the Guvierian ducts; these open transversely into the omphalo-mesenteric trunk close to the auricular cavity. The anterior cardinal veins issue from the cranium; they form the jugular veins, and communicate by an anastomosis that extends transversely. PLAN OP THE AORTA AND ITS ARCHES AT AN EARLY PERIOD. 1, Truncus arteriosus, witli one pair of aortic arches, and dotte
. The comparative anatomy of the domesticated animals. Veterinary anatomy. TSE FCETUS. 917 tlie anterior cardinal veins; and two posterior, tte posterior cardinal veins. The veins of the same side unite in twos, from which result the Guvierian ducts; these open transversely into the omphalo-mesenteric trunk close to the auricular cavity. The anterior cardinal veins issue from the cranium; they form the jugular veins, and communicate by an anastomosis that extends transversely. PLAN OP THE AORTA AND ITS ARCHES AT AN EARLY PERIOD. 1, Truncus arteriosus, witli one pair of aortic arches, and dotted lines indicating the position of the second and third pairs. 2, The same, with four pairs of aortic arches, and indications of the fifth. 3, The same, with the three posterior pairs of aortic arches, from which the permanent vessels of the embryo are developed, with dotted outlines showing the position of the two (now) obliterated anterior arches. 4, Permanent arterial trunks in their primitive form, the obliterated portions still shown in dotted outline, 1-5, Primitive aortic arches.—a, Aorta; p, Pulmonary artery; p', p", Branches to the lungs; aw', Boot of thoracic aorta (ad) on left side ; aw, Obliterated root springing from right side ; s", s', Subclavian artery; v, Vertebral; ax, Axillary; o, Common carotid; c'. External carotid; c". Internal carotid. from left to right. Bejow this anastomosis, the left vein gradually atrophies, as does the Guvierian duct of the same side; but the canal on the right side increases, and becomes the anterior vena cava. The posterior vena cava appears behind the liver towards the fifth month; it receives the veins of the kidneys and Wolffian bodies, and, behind, it anasto- moses with the cardinal veins. The latter disappear in their middle portion, and are replaced by the vertebral veins, the right of which forms the vena azygos. There only remain the two extremities of the cardinal veins; the anterior enters the Guvierian
Size: 2416px × 1034px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorchauveauaauguste18271, bookcentury1800, bookdecade1880
