The pericardium心包膜 Fibrous capsule enclosing the heart Separated by pericardial cavity filled with fluid To reduce the friction of heart during pumping Lined by serous pericardium浆膜心包 Subdivided into parietal and visceral layers 心包: the visceral layer reflected on the outer surface The parietal layer closely adheres to fibrous pericardium 4Ts heart, the external limit of epicardium心外膜, lined by mesothelium间皮 Perforated only at the roots of major vessels Reflections of serous pericardium forms transverse sinus ta and oblique sinus斜窦The Pericardium 心包膜 • Fibrous capsule enclosing the heart • Separated by pericardial cavity filled with fluid • To reduce the friction of heart during pumping • Lined by serous pericardium 浆膜心包 • Subdivided into parietal and visceral layers • The parietal layer closely adheres to fibrous pericardium 纤维 心包; the visceral layer reflected on the outer surface of heart, the external limit of epicardium 心外膜, lined by mesothelium 间皮 • Perforated only at the roots of major vessels • Reflections of serous pericardium forms transverse sinus 横窦 and oblique sinus 斜窦