Boyden classification of bronchi
The Boyden classification of bronchi refers to the standard nomenclature used to describe bronchopulmonary segmental anatomy.
Each lung has 10 segments, however on the left, the first two segments share a common trunk and are hence B1/2. Also given the shared trunk on the left of the lower lobe anterior and medial basal segments forming the anteromedial segment, B7 is omitted.
Classification
The right lung is subdivided into three lobes with ten segments. The notation in brackets refers to the Boyden classification. The number designates the secondary lobar bronchus.
-
right upper lobe
- apical segment (B1)
- posterior segment (B2)
- anterior segment (B3)
-
right middle lobe (or more correctly - just middle lobe)
- lateral segment (B4)
- medial segment (B5)
-
right lower lobe
- superior segment (B6)
- medial segment (B7)
- anterior segment (B8)
- lateral segment (B9)
- posterior segment (B10)
The left lung is subdivided into two lobes and thereby, into eight segments. The notation in brackets refers to the Boyden classification.
-
left upper lobe
- apicoposterior segment (B1/2)
- anterior segment (B3)
- superior lingular segment (B4)
- inferior lingular segment (B5)
-
left lower lobe
- superior segment (B6)
- anteromedial segment (B8)
- lateral segment (B9)
- posterior segment (B10)
Related Radiopaedia articles
Anatomy: Thoracic
- thoracic skeleton
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- intercostal space
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- variant anatomy
- spaces of the thorax
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lungs
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bronchopulmonary segmental anatomy (Boyden Classification) (mnemonic)
- left lung
- right lung
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bronchopulmonary segmental anatomy (Boyden Classification) (mnemonic)
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