Answer:
Carina of trachea
Step-by-step explanation:
Carina of trachea is the structure that lies in between the trachea and the two bronchi before separation. It is a cartilaginous ridge structure that is located on the left of the midline at the site of tracheal bifurcation at the fifth or sixth thoracic vertebral body
Its major purpose is to separate the openings of the right and left main bronchi.