What is the name of the cartilaginous ridge in the trachea at which the right and left lungs split?

The cartilaginous ridge in the trachea at which the right and left lungs split is known as the carina. This anatomical feature is crucial because it serves as the point where the trachea bifurcates into the left and right main bronchi, directing air into each lung. The structure of the carina helps to maintain the integrity of the airway while also facilitating airflow to both lungs efficiently.

Understanding the carina's location and function is essential for recognizing how the respiratory system directs air and responds to obstruction or injury in clinical scenarios. For example, during intubation or in conditions such as bronchospasm, knowledge of the airway's anatomy, including the carina, is vital for effective patient management.