Aorta SVC Pulmonary- trunk 3- Right pulmonary veins Left pulmonary veins IVC *Oblique pericardial sinus Anterior view 20. A surgeon needed to clamp the output of the heart and was searching for the space indicated by the pointer labelled "3". This space is called the a. Pulmonary artery b. Oblique sinus of the pericardium c. transverse sinus of the pericardium d. Superior vena cava e. Ascending aorta

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