The anterior apex of the lung is located approximately how many centimeters above the inner third of the clavicle?

• A. 3 to 4 cm above the inner third of the clavicle
• B. 1 to 2 cm above the inner third of the clavicle
• C. 5 to 6 cm above the inner third of the clavicle
• D. 0 cm above the inner third of the clavicle

Answer: (A)

The lungs reach into the neck, with the pleural dome rising above the clavicle. The anterior apex sits a few centimeters higher than the inner (medial) third of the clavicle, typically about 3 to 4 cm above that point. This is the distance clinicians use when estimating how high the lung and pleura extend, which is why 3–4 cm is the best match.

Knowing this helps explain why the apex is vulnerable in neck or shoulder trauma and why procedures near the clavicle must account for the pleural dome. Shorter distances (like 1–2 cm or 0 cm) understate the true apex height, while a much larger distance (5–6 cm) overestimates it.