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There are two pericardial sinuses: transverse and oblique.
- The cul-de-sac sinus, enclosed between the limbs of the inverted U of the venous mesocardium lies posterior to the left atrium and is known as the oblique sinus.
- The passage between the venous and arterial mesocardia—i.e., between the aorta and pulmonary artery anteriorly and the superior vena cava posteriorly —is termed the transverse sinus. Also, the sinus that forms in the pericardial cavity where the dorso-mesentary pericardium reside. Note: This sinus is clinically important because passing one end of clamp through the sinus, and the other end anterior to the aorta/pulmonary trunk will allow complete blockage of blood output. This is done during some heart surgeries.
- Can be used to pass ligature during cardiac surgery.