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Fig. 1. —Drawing shows posterior aspect of heart. Transverse sinus, mainly behind ascending aorta and pulmonary artery, is divided into anterior (1) and posterior (2) portions of superior aortic recess, inferior aortic recess (3), and left (4) and right (5) pulmonic recesses. Oblique sinus (6) lies posterior to left atrium. Pericardial sinus proper includes postcaval recess (7) and left (8) and right (9) pulmonary venous recesses. Note connections (arrows) between sinuses and recesses. Ao = aorta, SVC = superior vena cava, lPA = left pulmonary artery, rPA = right pulmonary artery, lPVs = left pulmonary veins, rPVs = right pulmonary veins, LA = left atrium, IVC = inferior vena cava.