Enumerate bronchopulmonary segments of right lung

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bronchopulmonary segments right lung diagram

Educational infographic and user interface overview for an automated pneumonia analysis platform. (A) Workflow diagram outlining a four-step diagnostic process: hierarchical lung segmentation using VB-Net, quantitative analysis of volumetric and numeric features, longitudinal image registration for monitoring disease progression, and 3D ResNet-based image classification for differential diagnosis (e.g., COVID-19 vs. Community-Acquired Pneumonia). (B) Progression of lung segmentation starting from raw axial CT images, moving through bilateral lung isolation, division into 5 lung lobes (3 right, 2 left), and final parcellation into 18 bronchopulmonary segments, with a 3D visualization of infected lesions highlighted in red. (C) Graphical user interface displaying a side-by-side comparison of axial CT scans from two time points (2019/06/18 and 2019/07/18), showing progressive opacifications in red. The interface includes quantitative panels for pneumonia diagnosis and severity assessment, detailing lesion volume by lobe and segment, alongside a component analysis histogram of CT Hounsfield Units (HU) to quantify infection intensity distribution.

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Here is a complete enumeration of the 10 bronchopulmonary segments of the right lung, organized by lobe, with standard segmental numbering (S I - S X):

Bronchopulmonary Segments of the Right Lung

The right lung has 3 lobes and 10 bronchopulmonary segments. Each segment is an independent unit supplied by its own segmental (tertiary) bronchus and a branch of the pulmonary artery, with pulmonary veins running intersegmentally. Each is cone-shaped with its apex toward the hilum and base on the lung surface.

1. Upper (Superior) Lobe - 3 segments

#	Segment	Bronchoscopic orifice
S I	Apical	4 o'clock
S II	Posterior	8 o'clock
S III	Anterior	12 o'clock

2. Middle Lobe - 2 segments

#	Segment	Bronchoscopic orifice
S IV	Lateral	3–6 o'clock
S V	Medial	9–12 o'clock

3. Lower (Inferior) Lobe - 5 segments

#	Segment	Bronchoscopic orifice
S VI	Superior (apical)	5 o'clock (just distal to middle lobe bronchus)
S VII	Medial basal	9 o'clock (usually most proximal of basal segments)
S VIII	Anterior basal	1 o'clock
S IX	Lateral basal	3 o'clock
S X	Posterior basal	6 o'clock

Note: In more than half of individuals, a subapical (subsuperior) segment is present in the lower lobe, with a posteriorly directed bronchus arising anywhere along the inferior lobar bronchus between S VI and the final basal division. This is sometimes counted as an accessory 11th segment.

Diagram (Right lung - medial and lateral views)

Bronchopulmonary segments of the right lung (top) and left lung (bottom), medial and lateral views

Fig. 3.49 from Gray's Anatomy for Students - Right lung (A, top panel) showing all 10 segments from medial and lateral views.

Bronchial tree diagram

Bronchial tree with lobar and segmental bronchi, and middle lobe bronchopulmonary segments highlighted

Quick Memory Aid: "3-2-5"

3 segments in the upper lobe (Apical, Posterior, Anterior)
2 segments in the middle lobe (Lateral, Medial)
5 segments in the lower lobe (Superior + 4 basal: Medial, Anterior, Lateral, Posterior)

For the lower lobe basals, use: "MALP" - Medial, Anterior, Lateral, Posterior basal.

Sources: Gray's Anatomy for Students, p. 209-210; Fischer's Mastery of Surgery (8th ed.), p. 2058

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