الفهرس 
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Abstract
The micromorphological structure of the lung tissue of 14 mature females Japanese quail was investigated using light and TEM. The histological study revealed that the lung was covered by a thin fibroelastic capsule sending septa into the parenchyma but not divide it into lobules. The primary bronchus was lined with high pseudostratified columnar ciliated epithelium with goblet cells and intraepithelial gland which sometimes form separate glands. Neutral and acidic mucopolysaccharides were detected in goblet cells and glands.The wall was supported by c-shaped hyaline cartilage at the first part, latter on was divided into plates. The primary bronchus leaded to secondary bronchi which were lined with the same type of epithelium of the primary one but with shorter cilia. The cartilage disappeared and the wall was supported by circular and oblique smooth muscle fibers. The tertiary bronchus (parabronchus) was observed arising from both bronchi. The parabronchus and the respiratory tissue form the lung units which were poorly separated from each other. The parabronchus leaded to atria which in turn gave off infundibula. The infundibula leaded to fine air capillary. The air capillary anastomosed with each other and in close contact with the blood capillaries forming gas exchange tissue. By TEM the atrium was lined by granular cells which had lamellar and vesicular bodies and squamous cell secrete trilaminar substance. The infundibula and the air capillaries were lined with squamous respiratory cells which secrete trilaminar substances. At the broncho-parabronchial junction, the wall decreased in thickness, the muscle divided into bundles, glandular tissue and the cartilage disappeared.