الفهرس | Only 14 pages are availabe for public view |
Abstract This study was carried-out to elucidate the light and ultrastructure morphology of the epithelial lining of the different parts of the intrapulmonary bronchial tree and the respiratory tissue of camel’s lung and its accommodation with the arid environment of the desert. The lungs of seventeen clinically healthy adult one- humped camels (Camelus dromedarius) of both sexes were used. Samples of lung tissue were prepared and examined by light, TEM and SEM. The mucosa of the intrapulmonary bronchi consisted of pseudostratified columnar ciliated with goblet cells, a basement membrane, and a lamina propria. With TEM, 4 types of cells were identified in the epithelial lining: Ciliated cells, goblet cells, brush cells and basal cells. The structural features of these cells were described. The ciliated and basal cells were the most numerous cell types. The brush cells were seen more often in the proximal bronchi. The cartilage plates were also disappeared gradually and became totally absent in the bronchioles. With SEM, the mucosa of the bronchi had regular longitudinal folds with transverse furrows in between. The mucosa of bronchioles had scalloped appearance due to contraction of the smooth muscles that surrounding the bronchiolar wall. They were lined mainly by columnar ciliated cells. With TEM, The larger bronchioles were lined with ciliated columnar cells, Clara cells and very rarely scattered brush cells. The cilia were found to decreasing in length, thickness and number distally. |