Inferior Viewpoint of the Colored Posterior Basal Segments of the Lungs

Description

Viewed from an inferior standpoint, the posterior basal bronchopulmonary segments (segmenta basalia posteriora, S10) occupy the most dependent portion of each lower lobe and sit posterolateral to the mediobasal segment (S7) where present. Their pleural surfaces curve superiorly to meet the posterior thoracic wall, lying posterior to the oblique fissures and inferior to the superior segment of the lower lobe (S6). Color coding isolates the basilar anatomy so the right and left S10 territories can be compared at a glance. Clear segmental boundaries. Posterior basal segments matter because gravity and airway anatomy conspire to make them frequent endpoints for aspirated material and dependent atelectasis in the supine patient. In bronchoscopy or segmentectomy planning, distinguishing S10 from adjacent basilar segments guides selective bronchial access (B10) and segmental lymphatic drainage patterns, and it helps explain why posterior lower-lobe opacities often track to a specific bronchopulmonary segment on CT. This angle also clarifies why posterior chest wall contact can localize pleuritic pain and percussion findings to the lower lobes. Pulmonology and thoracic surgery teaching sessions use this figure to pair bronchopulmonary segment maps with CT axial and coronal reconstructions, and to annotate operative notes for VATS segmentectomy of S10. Medical publishers can place it alongside aspiration pneumonia, lower-lobe bronchiectasis, or dependent consolidation discussions to support segment-based interpretation of imaging and physical exam correlations. Anatomical accuracy verified by SciePro's Medical Advisory Board.