Ascending Aorta and Pulmonary Trunk Form Anterior Border of Transverse Pericardial Sinus

The ascending aorta and pulmonary trunk form the anterior border of the transverse pericardial sinus. This passage lies posterior to these vessels and anterior to the superior vena cava and atrial structures. It is used surgically to pass a clamp for temporary vascular control.

• The ascending aorta and pulmonary trunk are anterior to the sinus; the superior vena cava and atria are posterior.
• This anatomical relationship allows a surgeon to pass a clamp or finger through the sinus behind the great vessels for temporary control during cardiac procedures.

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