GLOSSARY

The middle lobe is the smallest lobe of the lung, present only in the right lung, lying between the horizontal fissure (above) and the oblique fissure (below and behind), and seen mainly at the front of the chest.

Characteristics

• Two segments: medial and lateral.
• Middle lobe bronchus: narrow and long, with an acute angle, surrounded by numerous lymph nodes.
• Left-lung equivalent: the lingula of the left upper lobe.
• Auscultation site: from the front, between the fourth and sixth ribs on the right.

Clinical Application