Sun28November0333PM 47

Are the following true or false of the adult human trachea?

True / False

The left main bronchus angles off the trachea at 25° Correct

It is a midline structure that bifurcates at T4 Incorrect answer selected

The right main bronchus angles off the trachea at 45° Incorrect answer selected

It is a midline structure that starts at C6 Correct

It is approximately 25 cm long Correct

Explanation

The human trachea starts at C6 and extends to the level of T4 where the trachea bifurcates. It is approximately 15 cm long in an adult.

The right main bronchus separates from the trachea at a 25° angle, whereas the left main bronchus separates at an angle of 45°.

Reference:

Moore KL, Dalley AF, Agur AMR. Clinically Oriented Anatomy. 6th ed. Baltimore, MD: Lippincott Williams & Wilkins; 2009.

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