Carina
 
The carina is a keel-shaped cartilage lying at the tracheal bifurcation -- it separates the right main stem bronchus from the left main stem bronchus. The carina is a little to the left of the tracheal bifurcation, so if there is an inhaled body the carina will tend to divert foreign objects to the right main bronchus.
 

This where my tube should have been. Instead, it was placed too low, resting upon the Carina. Is it any wonder I felt like I was choking???

The mucous membrane of the Carina is the most sensitive area of the trachea and larynx for triggering a cough reflex.

 
Tracheobronchial injury, an injury to the airways, occurs within 2.5 cm of the carina 4080% of the time.