Posterior to transverse pericardial sinus is:
* Transverse pericardial sinus lies between the aoa and pulmonary trunk anteriorly and the superior vena cava posteriorly. Boundaries :- Below-left atrium Above - bifurcation of pulmonary trunk Behind(posterior)- superior vena cava In front- ascending aoa and pulmonary trunk * Clinically, in cardiac surgery, temporary ligature or clamp is passed through transverse pericardial sinus to stop or dive the circulation of blood in large aeries .
Aoa
Pulmonary trunk
SVC
Left atrium
CVS Embryology