When assessing posteriorly, where would the trachea bifurcate into its mainstem bronchi?

Question: When assessing posteriorly, where would the trachea bifurcate into its mainstem bronchi?

When assessing posteriorly, the trachea bifurcates into its mainstem bronchi at the level of the sternal angle (also known as the angle of Louis). The sternal angle is the junction between the manubrium and the body of the sternum, and is located at the level of the second rib. At this level, the trachea divides into two mainstem bronchi: the right mainstem bronchus, which is wider, shorter, and more vertical than the left mainstem bronchus, which is narrower, longer, and more horizontal. The mainstem bronchi then divide further into smaller bronchi and eventually into bronchioles, which lead to the alveoli where gas exchange occurs.

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