Now our inner cirrus layer can actually be subdivided into two regions. We have the parietal and the visceral layer. Now the parietal layer of the inner pericardium is this orange layer right here, while the visceral layer of the inner pericardium is this inner layer of our pericardium shown in orange. And this space between the visceral and the parietal layer of the inner pericardium is known as the pericardial space or the pericardial cavity. And this contains the pericardial fluid and that fluid lubricates our heart, decreasing the friction that the heart feels every time it actually contracts. So together these two layers of the pericardium protect the heart.