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Overview of the Anatomy of the Lungs
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Overview of the Anatomy of the Lungs Large Airways and Small Airways
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Central Airways
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Right lung
This diagram shows the segmental branches of the right bronchial system.  The RUL has three branches, the apical, posterior and anterior segments. (teal overlay)  The middle lobe has two segmental branches called lateral and medial segments. (pink)  The right lower lobe has five: the superior, anterior basal, lateral basal, posterior basal and medial basal segments.  Ashley Davidoff MD.   TheCommonVein.net 32686b03
Left lung
This is a drawing is of a left lung in coronal section. Note there are only two lobes separated by the major fissure
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Length of the Bronchi
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Diameters of the bronchi
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3D reconstruction of a CT scan showing the tracheobronchial tree including the trachea, mainstem bronchi, lobar airways and the segmental airways
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Pulmonary arteries
This coronal reformat shows the position of the main branch pulmonary arteries relative to the position of their respective bronchi.  While the RPA runs under the right mainstem bronchus, the LPA runs above the left mainstem.
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Main Stem Bronchi
To remember the difference in the sizes of the mainstem bronchi think of 2 very different men in the airways. The right – short, stout and cute, and the left – tall thin and gracile
The carinal angle is about 85 degrees
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This diagram reflects the laminar flow showing the almost parallel lines of flow that is characteristic of flow in the smaller tubes. Under resting conditions, laminar flow exists from the medium-sized bronchi onward down to the bronchioles. During exercise, the air flow is accelerated, and laminar flow may be confined only to the very small airways.
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