جامعة تكريت - كلية الطب البيطري - جامعة تكريت

Histological Study of Lower Respiratory System on Cats

(Felis Catus Domesticus. L)

Rabab Abd Alameer Nasser¹ , Shakir Mahmood Mirhish²

¹ College of Veterinary Medicine , Diyala University , Diyala , Iraq

² Department of Anatomy and Histology, College of Veterinary Medicine , Baghdad University , Baghdad , Iraq    

E-mail : عنوان البريد الإلكتروني هذا محمي من روبوتات السبام. يجب عليك تفعيل الجافاسكربت لرؤيته. عنوان البريد الإلكتروني هذا محمي من روبوتات السبام. يجب عليك تفعيل الجافاسكربت لرؤيته.

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The present study was  designated to demonstrate the histological features ofLower Respiratory System in Cats. The histological specimens of the trachea, bronchi and lungs were stained with haematoxyline and eosin, alcian blue at a pH (2.5), Periodic Acid-Schiff (PAS), Van Gisons and Masson Trichrom stains. The microscopic results of the trachea demanstrated   incomplete hyaline cartilaginous ring like c-shape and it had four types of cells were identified in cross section of mucosa (pseudostratified columnar ciliated with  goblet cells), then the sub mucosal glands which separated from the underlying hyaline cartilage. Theends of hyaline cartilage were attached by smooth muscle called tracheal muscle. the sub mucosal glands located internally to the trachealis  muscle, the sub mucosa presenttubulo-acinar shape and composed of mixed secretory cells (serous and few mucus), they were greater in the ventral aspect and less in the dorsal aspect of the trachea. The lung was surrounded by a thin layer  of flatted cuboidal mesothelium cell called pleura, the bronchus divided to primary and secondary bronchus which lead to the tertiary bronchus continuously reach to the terminal bronchioles which opening into the respiratory bronchioles, and finally connected to the alveolar duct and then alveolar sac  compose of the alveoli which consist of the three types of cells:  type I was the predominate cell: squamous cell ,responsible for gaseous exchange, while type II cell was the source of pulmonary surfactant and macrophage or dust cell.

Key Words:Microscopic feature of lower respiratory system, Trachea, Lung, Cat, (Felis Catus Domesticus. L).