Anatomy study note · Thorax

Bronchopulmonary segments

The anatomic, functional and surgical units of the lung. Each is a pyramid-shaped part of a lobe, apex toward the hilum, supplied by its own segmental (tertiary) bronchus.

Key points

• Unit = segmental bronchus + artery centrally; veins at the edges.
• Right lung 10 segments; left 8–10.
• Lingula = superior + inferior lingular segments of the left upper lobe.
• Can be resected individually.
• Segmental bronchi from lobar bronchi; ~17 divisions before birth.
• Type I pneumocyte: gas exchange. Type II: surfactant.
• Bronchioles: no cartilage, no glands.

The full note in the atlas also covers

Features · Histology · Development · Clinical notes

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Written from

• Snell’s Clinical Anatomy by Regions, 10th ed., ch. 5, PDF pp. 579–584, 594–595
• Inderbir Singh’s Human Embryology, ch. 14, PDF pp. 208–209
• BRS Cell Biology & Histology, 7th ed., ch. 15, PDF pp. 271–279, 280

More from the thorax

• Coronary sinus and cardiac veins
• Costal cartilages
• Descending thoracic aorta
• Diaphragm
• Esophagus
• First rib
• Heart
• Intercostal arteries
• Intercostal muscles
• Intercostal nerves
• Internal thoracic artery
• Internal thoracic vein

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