Which fissure forms the inferior boundary of the right middle lobe?

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Multiple Choice

Which fissure forms the inferior boundary of the right middle lobe?

Explanation:
The right middle lobe is bounded above by the horizontal fissure and below by the oblique fissure, which separates it from the lower lobe. So the inferior boundary of the middle lobe is the oblique fissure. The cardiac notch is a feature of the left lung near the heart and isn’t a fissure, and there isn’t a standard “lateral fissure” defining the right middle lobe. Hence the oblique fissure is the correct boundary.

The right middle lobe is bounded above by the horizontal fissure and below by the oblique fissure, which separates it from the lower lobe. So the inferior boundary of the middle lobe is the oblique fissure. The cardiac notch is a feature of the left lung near the heart and isn’t a fissure, and there isn’t a standard “lateral fissure” defining the right middle lobe. Hence the oblique fissure is the correct boundary.

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