. Diseases of poultry; their etiology, diagnosis, treatment, and prevention. Poultry. 148 Diseases of Poultry posterior end of its lung where it opens into the abdominal air sac. This relation is shown in Fig. 26. The primary bronchus gives off secondary bronchi which radiate toward the surface of the lungs. The secondary bronchi give off smaller radiating branches, the tertiary bronchi. Both primary and secondary bronchi remain of practically uniform ~(f' diameter through- ^.."^^^ • ;.. out their entire •""^ ^ length. P'or the most part these tubes end blindly, but s
. Diseases of poultry; their etiology, diagnosis, treatment, and prevention. Poultry. 148 Diseases of Poultry posterior end of its lung where it opens into the abdominal air sac. This relation is shown in Fig. 26. The primary bronchus gives off secondary bronchi which radiate toward the surface of the lungs. The secondary bronchi give off smaller radiating branches, the tertiary bronchi. Both primary and secondary bronchi remain of practically uniform ~(f' diameter through- ^.."^^^ • ;.. out their entire •""^ ^ length. P'or the most part these tubes end blindly, but some of them communicate with the air sacs. This tubular system makes up the air- containing portion of the lungs. It is embedded in a net- work of almost naked blood vessels which make up the spongy tissue of the lungs. The aera- tion of the blood takes place through the walls of these vessels. The intimate relations of the tubular and vascular systems of the lungs are shown in Fig. 28. The air sacs are very large, thin-walled sacs which open into the bronchial tubes as described. When expanded with air these sacs fill all the available space in the thoracic- abdominal cavity and axilla. A small sac also lies along the. Fig. 26. — Diagrammatic drawing of the left lung of a domestic fowl, a, primary bronchus ; b, secondary bronchus; b^, openings of other secondary bronchi; c, opening of tertiary bronchus ; d, openings into air sacs. (Origi- nal.). 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 Pearl, Raymond, 1879-1940; Surface, Frank M. (Frank Macy), 1882- joint author; Curtis, Maynie R. (Maynie Rose), b. 1880, joint author. New York, The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectpoultry, bookyear1915
