TRAY-kee-uh) A ridge at the base of the trachea (windpipe) that separates the openings of the right and left main bronchi (the large air passages that lead from the trachea to the lungs). Also called tracheal carina.
The carina represents the inferior termination of the trachea into the right and left main bronchi. The carina usually sits at the level of the sternal angle and the T4/T5 vertebral level in the thoracic plane.
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Traditionally, the carina has been located by the radiologist either by taking the position as the middle of the T4-T5 interspace; or by using the Dee Method, which involves identifying the aortic arch and then drawing a line inferomedially through the middle of the arch at a 45-degree angle to the midline.
The most inferior portion of the trachea, the bifurcation, is called the carina. It lies slightly to the right of the midline at the level of the fourth or fifth thoracic vertebra posteriorly and sternomanubrial junction anteriorly.
Anatomy: secondary carina: right side. On the right, the carina between the right middle lobe bronchus and the bronchus to the right lower lobe is named the right carina 2 or RC-2, The carina dividing the right upper lobe from the bronchus intermedius is called the right carina 1 or RC-1. 5/26/17.
Morphological changes in the carina are important diagnostic signs. If the carina is distorted or widened posteriorly, it may indicate subcarinal disease or mass involvement of the proximal airway (2). At the carina, the trachea bifurcates into the right and left mainstem bronchus.
Bronchial Tree. The trachea branches into the right and left primary bronchi at the carina. These bronchi are also lined by pseudostratified ciliated columnar epithelium containing mucus-producing goblet cells (Figure).
The lobar bronchus is the major airway within the respiratory tree that starts by division of the principal bronchi on both sides and ends at the point of its own subdivision into tertiary or segmental bronchi[GO].
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