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Oblique sinus
The heart has been removed by cutting the vessels (SVC, aorta, pulmonary trunk, pulmonary veins and IVC). The space bound by the IVC and the right pulmonary veins (in the lower part of the image) and the left pulmonary veins, is the oblique sinus of pericardium. Before the heart was removed, my fingers could trace the cul de sac! The left atrium, occupying most of this space forms the base of the heart.
Dr. S. Chandra
Dr. S. Chandra, Faculty of Medicine, Memorial University of Newfoundland
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