The lungs are divided into lobes. The right lung consists of three lobes, while the left one - of two.

Each lobe is subdivided into bronchopulmonary segments based on segmental bronchi. And segments further divide into even smaller subdivisions - lobules.

The segments of the lung are conical in shape, separated from each other by layers of connective tissue.

Each bronchopulmonary segment is a discrete anatomical, functional, and also surgical unit. Therefore surgical removal of a segment does not affect the function of the other segments.

There are three lobes forming the right lung - the superior, middle, and inferior lobes.

The superior lobe of the right lung consists of three bronchopulmonary segments: apical, posterior, and anterior segments.
The middle lobe of the right lung has two segments: lateral and medial segments.
The inferior lobe of the right lung consists of five segments: superior, anterior basal, medial basal, lateral basal, and posterior basal segments.

The left lung is divided into two lobes - the superior lobe and inferior lobe.

The superior lobe of the left lung consists of four bronchopulmonary segments: apicoposterior, anterior, superior lingular, and inferior lingular segments.
The inferior lobe of the left lung has four segments: superior, anteromedial basal, lateral basal, and posterior basal segments.

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Lung lobes