What is the level of bifurcation of the trachea in a living person?

In a living person, the trachea bifurcates into two main branches known as the primary bronchi. This bifurcation typically occurs at a point called the carina, which is located at the level of the sternal angle (also known as the Angle of Louis) in the mediastinum. The sternal angle is where the manubrium (upper part of the sternum) meets the body of the sternum.

Each primary bronchus enters one of the lungs and then further divides into smaller bronchial branches, creating a branching network of bronchi and bronchioles within the lungs. The right primary bronchus is wider, shorter, and more vertical than the left primary bronchus due to the anatomy of the lungs. This anatomical arrangement is important for the distribution of air and the exchange of gases in the respiratory system.