|Carina of trachea|
Transverse section of the trachea, just above its bifurcation, with a bird's-eye view of the interior. (Carina not labeled; the ridge that separates the left and right bronchus.)
|Latin||Carina tracheae, bifurcatio tracheae|
The carina occurs at the lower end of the trachea (usually at the level of the 4th to 5th thoracic vertebra). This is in line with the sternal angle, but the carina may raise or descend up to two vertebrae higher or lower with breathing. The carina lies to the left of the midline, and runs antero-posteriorly (front to back).
Foreign bodies that fall down the trachea are more likely to enter the right bronchus.
The mucous membrane of the carina is the most sensitive area of the trachea and larynx for triggering a cough reflex.