Diseases of poultry; their etiology, Diseases of poultry; their etiology, diagnosis, treatment, and prevention diseasesofpoultr00pear Year: 1915 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 - -d diameter through- â .,.-. out their entire length. For the most part these
Diseases of poultry; their etiology, Diseases of poultry; their etiology, diagnosis, treatment, and prevention diseasesofpoultr00pear Year: 1915 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 - -d diameter through- â .,.-. out their entire length. For 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. â 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.)
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