Answer:
The correct answer is e. Transverse pericardial sinus. In cardiac surgery, it is sometimes necessary to clamp off all arterial flow out of the heart by inserting the index finger immediately behind the two great arteries and compressing them with the thumb of the same hand. In this case, the index finger would be inserted into the transverse pericardial sinus, which is a small space located between the pericardium and the heart. This procedure is typically used to control bleeding or to stop the heart from beating during certain surgical procedures.