. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 368 COMPARATIVE PHYSIOLOGY. great extent, lined with flattened cells and supporting innu- merable capillary blood-vessels. The air is admitted to the com-. FiG. 290.—Bronchia and lungs, posterior view (Sappey). 1,1, summit of lungs; 2,2, base of lungs; 3, trachea; 4, right bronchus; 5, division to upper lobe of ning; 6, division to Tower lobe; 7, left bronchus; 8, division to upper lobe; 9, division to lower lobe; 10, left branch of pulmonary artery; 11, right b
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 368 COMPARATIVE PHYSIOLOGY. great extent, lined with flattened cells and supporting innu- merable capillary blood-vessels. The air is admitted to the com-. FiG. 290.—Bronchia and lungs, posterior view (Sappey). 1,1, summit of lungs; 2,2, base of lungs; 3, trachea; 4, right bronchus; 5, division to upper lobe of ning; 6, division to Tower lobe; 7, left bronchus; 8, division to upper lobe; 9, division to lower lobe; 10, left branch of pulmonary artery; 11, right branch; 13, left auricle of heart; 13, left superior pulmonary vein; 14, left inferior pulmonary vein; 15, right superior pulmonary vein; 16, right inferior pulmonary vein; 17, inferior vena cava; 18, left ventricle of heart; 19, right ventricle. plicated foldings of this membrane by tubes which remain, throughout the greater part of their extent, open, being com- posed of cartilaginous rings, completed by soft tissues, of which plain muscle-cells form an important part, serving to main- tain a tonic resistance against pulmonary and bronchial press- ure, as well as serving to aid ia the act of coughing, etc., so important in expelling foreign bodies or preventing their ingress. The bronchial tubes are lined with a mucous membrane, kept moist by the secretions of its glands, and covered with ciliated epithelium, as are also the nasal passages, which, by the outward currents they create, favor diffusion of gases and removal of excess of mucus. The thoracic walls and the lungs. 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 Mills, Wesley, 1847-1915. New York, Appleton
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