And the function of the pericardium is not only to protect the heart from physical damage, it's to also lubricate the heart and it's to also attach the heart to other parts of our body. So to actually examine what the pericardium looks like, let's take a cross section of the heart. We get the following diagram. So we have the blood vessels around the heart. We have the four chambers of the heart shown here. We have the actual heart shown in red.