الفهرس 
English CoverOnly 14 pages are availabe for public view
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Abstract
Studying the anatomical differences of the respiratory system of both rabbit and cat offers a valuable evidence for clinicians regarding the possibility of utilization as models to human being studies. This work was conducted using clinically healthy twenty five for each domestic cats and White New Zealand rabbits, of different sexes and weights. Different techniques were applied from drying, fixed, specimens as well as histological and histochemical studies. The nostrils of rabbit were slit like opening with complete deep cleft philtrum while the cat nostrils were semicircular with shallow grooved philtrum. The nasal septum of rabbit was three layers while in the cat was only single layer. The nasal septum of both rabbit and cat showed high level of acidic mucins in the lining epithelium and low level of neutral mucins. The corniculates and cuniform cartilages were appeared in the larynx of the rabbit and disappeared in the cat. Histologically the thyroid cartilage of both rabbit and cat was hyaline in nature. The lung of the rabbit and cat was extended from the second rib and reached to the seventh rib in cases of rabbit while in the cat reached the eleventh rib. The middle thyroid artery and vein were appeared only in the rabbit while in the cat the caudal thyroid artery and vein were recognized instead of the middle one.