الفهرس 
Contents
Transmission Electron MicroscopyOnly 14 pages are availabe for public view
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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.