Surface Anatomy and Landmarks · USMLE Step 1

The transverse thoracic plane is used as a surface reference in thoracic anatomy. Which structure is located at this plane?

  1. Aortic bifurcation
  2. Bifurcation of trachea
  3. Inferior vena cava opening
  4. Right atrial appendage
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Correct answer: Bifurcation of trachea

The tracheal bifurcation (carina) lies at the transverse thoracic plane (T4–T5). This is a key mediastinal landmark.

Difficulty: Medium Question 16 of 20

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