Anatomy of the bronchopulmonary segments

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Anatomy of the bronchopulmonary segments

Each of the tertiary bronchi serves a specific bronchopulmonary segment. These segments each have their own artery. Thus, each bronchopulmonary segment is supplied by a segmental bronchus, and two arteries, a pulmonary artery and a bronchial artery which run together through the center of the segment. Veins and lymphatics drain along the edges.

There are 10 bronchopulmonary segments in the right lung (3 in superior lobe, 2 in middle lobe, 5 in inferior lobe) and 9 segments on the left (4 in upper lobe, 5 in lower lobe).

Right lung, superior lobe
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Apical segment [S I]
Posterior segment [S II]
Anterior segment [S III]

Right lung, middle lobe
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Lateral segment [S IV]
Medial segment [S V]

Right lung, inferior lobe
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Superior segment (Fowler) [S VI]
Medial basal segment [S VII]
Anterior basal segment [S VIII]
Lateral basal segment [S IX]
Posterior basal segment [S X]

Left lung, superior lobe
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Apicoposterior segment [S I+II]
Anterior segment [S III]
Superior lingular segment [S IV]
Inferior lingular segment [S V]

Left lung, inferior lobe
-----------------------------------
Superior segment (Fowler) [S VI]
Medial basal segment [S VII]
Anterior basal segment [S VIII]
Lateral basal segment [S IX]
Posterior basal segment [S X]

Note : there are some variation in the nomenclature and numbers of lobes, for example, in the lower lobe of left lungs, some authors merge the anterior and medial basal segments, with only 4 segments in this lobe.

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