and runs antero-posteriorly (front to back).

Blood supply

The bronchial arteries supply the carina and the rest of the lower trachea.

Relations

The carina is around the area posterior to where the aortic arch crosses to the left of the trachea. The azygos vein crosses right to the trachea above the carina.

Physiology

The mucous membrane of the carina is the most sensitive

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