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The trachea is a semi-rigid air-filled tube that connects the larynx with the bronchial system. The trachea ends caudally with a crest, called the carina, which divides and channels the airflow into the two mainstem bronchi. In a normal dog and cat the carina should be located at the level of the fourth or fifth intercostal space. The chapter considers Radiographic anatomy; Interpretive principles; Diseases.
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