Regarding the anatomy of the trachea, a ridge in the lowermost cartilage before it branches into primary bronchi is more likely called Carina.
The tracheal cartilaginous ridges help to strengthen the windpipe. The most sensitive region of the trachea and larynx is the carina, which has a highly innervated mucous membrane. Its primary function is to prevent choking.
A ridge at the base of the trachea (windpipe) that separates the right and left main bronchial openings (the large air passages that lead from the trachea to the lungs). Also known as tracheal carina. If food or water is inadvertently inhaled, sensory nerve endings in the carina cause coughing.
The carina is a cartilage ridge in the trachea that takes place between the split of the two main bronchi. Cartilages of the larynx, the trachea, and the bronchi. (Carina is at a fork in the road.)
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