The structure present anterior to transverse pericardial sinus is
Transverse sinus is a horizontal gap between the aerial and venous ends of the hea tube, it is bound Anteriorly: ascending aoa, pulmonary trunk Posteriorly: SVC Inferiorly: L. atrium On each side it opens into the general pericardial cavity. Oblique sinus is a narrow gap behind the hea. It is bound anteriorly : L. atrium posteriorly: R. parietal pericardium, oesophagus.
Inferior vena cava
Superior vena cava
Aoa
Pulmonary aery
CVS Embryology