The pericardium has an outer fibrous sac and a double-layered serous membrane that encloses the pericardial cavity between its parietal and visceral layers.
■ The transverse pericardial sinus is a space posterior to the ascending aorta and pulmonary trunk and anterior to the superior vena cava and left atrium.
■ The oblique pericardia] sinus is a blind, inverted, U-shaped space posterior to the heart and bounded by reflection of serous pericardium around die four pulmonary veins and the inferior vena cava as they enter the heart.
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