. On the anatomy of vertebrates [electronic resource] . Bronchial cartilages of the Dugong. 530 ANATOMY OF VERTEBRATES. lages of the bronchial tubes are continued spirally into one another,fig. 451: the pulmonary arteiy lies to the outer side of the bronchusand is deeper seated, the pulmonary vein to the inner side andsuperficially. The principal branch Of the bronchus, b, fig. 452,runs down near the inner margin of the lung, and continuesdistinct to within four inches of the end; it then divides intosmaller branches ; the larger ramifications are given off fromits outer side, c, c. In all the
. On the anatomy of vertebrates [electronic resource] . Bronchial cartilages of the Dugong. 530 ANATOMY OF VERTEBRATES. lages of the bronchial tubes are continued spirally into one another,fig. 451: the pulmonary arteiy lies to the outer side of the bronchusand is deeper seated, the pulmonary vein to the inner side andsuperficially. The principal branch Of the bronchus, b, fig. 452,runs down near the inner margin of the lung, and continuesdistinct to within four inches of the end; it then divides intosmaller branches ; the larger ramifications are given off fromits outer side, c, c. In all the branches the cartilaginous ringscontinue distinct and strong till their diameter is contracted to one 452. Section of terminal part of lung, Dugong. or two lines; the rings passing irregularly into each other as inthe main trunks. The lining membrane of the air-tubes is throwninto longitudinal rugae, indicating their dilatability. The super-ficial air-cells, ib. a, are six times larger than in the Porpoise. The pleura costalis is dense in both Cetacea and Sirenia, as is thesubserous tissue of the e pleura pulmonalis. In the Elephant the right lung sends a lobular process, behindthe thoracic postcava, into the space between the heart and dia-phragm, but both this and the left lung are undivided. Thetrachea has thirty rings, many of which are partially cleft. In the Rhinoceros (Rh. indie us) the trachea has thirty-onerings: they are close-set, cleft behind, the ends meeting: thelining membrane is longitudinally rugous, as is that of the bron-chial ramifications for some way into the lung. Each lung isdivided into a small upper and a large lower lobe ; the right lungalso gives off a transvers
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