Posterior Segmental Artery of the Right Lung

Description

Arising from the right pulmonary artery at the hilum, the posterior segmental artery (A2) courses posteriorly and laterally toward the superior lobe of the right lung, then breaks into distal arterial branches and arterioles that accompany the segmental bronchus to the posterior segment. A posterior projection places the tracheal bifurcation and right main bronchus centrally, with the superior lobar bronchus and its segmental divisions fanning outward while pulmonary veins run more anterior and inferior on their return to the left atrium. The heart sits inferior and medial to the lung roots, providing an anchor for the pulmonary trunk and right pulmonary arterial tree as it distributes to lobar and segmental levels. Small-caliber vessels dominate the periphery. Isolating A2 from a posterior viewpoint matters when you need to teach or plan around segmental anatomy rather than lobar anatomy, because the posterior segment sits deep against the vertebral column and is a common site for aspiration-related infection and postural drainage discussions. Surgeons rely on the consistent pairing of the posterior segmental artery with the posterior segmental bronchus during right upper-lobe segmentectomy, and radiologists correlate this branching pattern on CT angiography to confirm the target segment and avoid vascular injury. Orientation is everything. This angle makes the distal course easier to trace than an anterior projection. Use this illustration in thoracic surgery teaching files (segmentectomy and VATS planning), pulmonary medicine lectures on segmental bronchopulmonary units, and radiology or anatomy texts that explain right upper-lobe vascular variants and segmental localization on cross-sectional imaging. It also fits cardiopulmonary circulation overviews where you want the pulmonary arterial tree tied visually to the tracheobronchial branching pattern. Anatomical accuracy verified by SciePro's Medical Advisory Board.