A system of obstetrics . Diagrams to illustrate the Development of the Aortic Arches (from Landois): 1, the first threepairs of arches, the first pair only fully developed; 2, the five pairs of aortic arches; ta,bulbus arteriosus ; ad, dorsal aorta; 3, stage when the greater portion of the first and secondarches has become obliterated ; S, left subclavian artery; v, right vertebral artery; ax, rightaxillary artery; 4, transition to the final stage; P, pulmonary artery; A, aorta; S, rightsubclavian, continuous with the fourth arch on that side and with the origin of the com-mon carotid; Ci and
A system of obstetrics . Diagrams to illustrate the Development of the Aortic Arches (from Landois): 1, the first threepairs of arches, the first pair only fully developed; 2, the five pairs of aortic arches; ta,bulbus arteriosus ; ad, dorsal aorta; 3, stage when the greater portion of the first and secondarches has become obliterated ; S, left subclavian artery; v, right vertebral artery; ax, rightaxillary artery; 4, transition to the final stage; P, pulmonary artery; A, aorta; S, rightsubclavian, continuous with the fourth arch on that side and with the origin of the com-mon carotid; Ci and Ce, internal and external carotids; dB, ductus arteriosus; v and ax,respectively, the vertebral and axillary arteries of the left side. enlarge, and its proximal portion remains throughout life as the stumpof the pulmonary artery. Fig. Diagram showing the Primitive Aortic Arches of the Mammal, with their transformations (fromAllen Thomson, after Rathke): A, P, primitive aortic bulb, now divided into ascendingpart of aortic arch, A, and the root of the pulmonary arteries, P; o, a, primitive union ofaortic arches to form the permanent dorsal aorta, A; 1, 2, 3. ;, the primitive aortic arches;I. II. III. [V, the branchial (pharyngeal) clefts, omitted on the opposite side for the sake ofclearness. The permanent systemic vessels are represented in deep shading,the pulmo-nary system in lighter shading, and parts of the original arches which are purely temporaryare only Indicated in outline, c lies between the origins of the common carotids; ,internal carotids ; ce, external carotids ; g, right subclavian : v, right vertebral ; ?< and r, leftsubclavian and vertehral; P, right and left pulmonary arteries; d, ductus arteriosus; pn,pn, pneumogastric nerves, illustrating the relationships of their recurrent bran
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectobstetrics, bookyear1
