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Bronchopulmonary segmental anatomy

Bronchopulmonary segmental anatomy describes the division of the lungs into segments based on the tertiary bronchus.

After the trachea divides and the left and right main stem bronchi are formed, they enter the lung substance and divide.  This initial division is into secondary bronchi, but subsequent divisions give rise to smaller and smaller bronchi and bronchioles until the smallest bronchioles connect to the innumerable alveoli.

Each segment has its own pulmonary arterial branch and thus, the bronchopulmonary segment is a portion of lung supplied by its own bronchus and artery. Each segment is functionally and anatomically discrete meaning that a single segment can be surgically removed without affecting its neighbours.

Left lung

The left lung is subdivided into two lobes and thereby, into eight segments:

Right lung

The right lung is subdivided into three lobes with ten segments:


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