Respiratory System Anatomy Practice Test

Understanding how the lungs are divided by fissures helps here. The right lung contains two fissures: a horizontal fissure that splits off a middle lobe from the superior lobe, and an oblique fissure that separates the middle from the inferior lobe. This gives the right lung three lobes: superior, middle, and inferior. The left lung, by contrast, has only an oblique fissure and thus two lobes (superior and inferior) with no horizontal fissure. So the fissure pattern that is unique to the right lung is having both a horizontal fissure and an oblique fissure.