Posterior Segment Structure of the Right Pulmonary Lobe

Description

Posteriorly oriented anatomy of the right lung’s superior lobe is emphasized, centering on the posterior segment (segmentum posterius, S2). Superior to it sits the apical segment (S1), and anteriorly lies the anterior segment (S3), together forming the upper lobe segmental pattern around the segmental bronchi and accompanying pulmonary arterial branches. Laterally, the visceral pleura conforms to the inner curvature of the ribs, while medially the segment approaches the hilar structures where the right main bronchus divides into lobar and segmental bronchi. A segmental framework. Segmental anatomy matters when you need to localize disease to a bronchopulmonary segment rather than an entire lobe. The posterior segment of the right upper lobe is a common site of aspiration-related infection in supine patients because dependent airways and alveoli collect secretions posteriorly, and it is also a frequent target when describing segmental atelectasis patterns on chest radiography or CT. Surgeons and interventional pulmonologists rely on this map during right upper lobe segmentectomy, using the S2 bronchus and its arterial branch as key guides while preserving adjacent segmental planes. Use this illustration in thoracic anatomy teaching, radiology correlation modules that pair bronchopulmonary segments with CT landmarks, and cardiothoracic surgical texts explaining segmentectomy versus lobectomy in early-stage lung cancer. It also fits ICU and pulmonary medicine education when discussing aspiration pneumonia distribution and postural drainage positioning. Anatomical accuracy verified by SciePro's Medical Advisory Board.