Which statement about lung lobes is correct?

Which statement about lung lobes is correct?

• A. The left lung has a middle lobe.
• B. The right lung has a middle lobe.
• C. The left lung has three lobes.
• D. Both lungs have five lobes.

Answer: (B)

Lung lobes are separated by fissures, and the right side has an extra lobe. The right lung has three lobes—the upper, middle, and lower—split by a horizontal fissure between the upper and middle lobes and an oblique fissure between the middle and lower lobes. The left lung has two lobes—the upper and lower—separated by a single oblique fissure and shaped in part by the cardiac notch, which reduces space on that side. Because of these patterns, a middle lobe is present only on the right. So the statement that the right lung has a middle lobe is correct. The left lung does not have a middle lobe, and neither lung has five lobes.

Lung lobes are separated by fissures, and the right side has an extra lobe. The right lung has three lobes—the upper, middle, and lower—split by a horizontal fissure between the upper and middle lobes and an oblique fissure between the middle and lower lobes. The left lung has two lobes—the upper and lower—separated by a single oblique fissure and shaped in part by the cardiac notch, which reduces space on that side. Because of these patterns, a middle lobe is present only on the right. So the statement that the right lung has a middle lobe is correct. The left lung does not have a middle lobe, and neither lung has five lobes.