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
- thoracic cage
- thoracic spine
- articulations
- muscles of the thorax
- diaphragm
- intercostal space
- intercostal muscles
- variant anatomy
- spaces of the thorax
- thoracic viscera
- tracheobronchial tree
-
lungs
-
bronchopulmonary segmental anatomy (Boyden Classification) (mnemonic)
- left lung
- right lung
- variant anatomy
- lung parenchyma
- hilum
- pleura
-
bronchopulmonary segmental anatomy (Boyden Classification) (mnemonic)
-
heart
- cardiac chambers
- heart valves
- pectinate muscles
- cardiac fibrous skeleton
- coronary arteries
- innervation of the heart
- fetal circulation
-
pericardium
- pericardial space
- oblique pericardial sinus
- transverse pericardial sinus
-
pericardial recesses
- aortic recesses
- pulmonic recesses
- postcaval recess
- pulmonary venous recesses
- pericardial ligaments
- epicardial fat pad
- esophagus
- thymus
- breast
- blood supply of the thorax
- arteries
-
thoracic aorta (development)
- ascending aorta
- aortic arch
- aortic isthmus
- descending aorta
- pulmonary trunk
-
thoracic aorta (development)
- veins
- superior vena cava (cavoatrial junction)
- inferior vena cava
-
coronary veins
- cardiac veins which drain into the coronary sinus
- great cardiac vein
- middle cardiac vein
- small cardiac vein
- posterior vein of the left ventricle
- vein of Marshall (oblique vein of the left atrium)
- anterior cardiac veins
- venae cordis minimae (smallest cardiac veins or thebesian veins)
- cardiac veins which drain into the coronary sinus
- pulmonary veins
- arteries
- lymphatics
- innervation of the thorax
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