I think it's the middle part of the central tendon of the diaphragm
Pericardium Pericardium
the epicardium helps form the pericardium
The immediate protector of the heart is the pericardium, which is the sac that surrounds the heart. The heart is also protected by muscle, bone, and skin.
the serous visceral pericardium.
The membranes from superficial to deep are: A sac-like structure called pericardium. It is comprised of two parts - the outer fibrous pericardium and an inner double-layered membrane itself made up of parietal and visceral pericardium.
The diaphragm
Conical firo-serous cac behind sternum and cartilage of 3-8th rib.
Spinal cord......
The Urethra
inferior
Fibrous pericardium and serous pericardium. The serous pericardium is made up of an outer parietal layer that is fused to the fibrous pericardium and an inner visceral layer (aka epicardium) that is a layer of the heart wall and adheres tightly to the heart.
There are three layers to the pericardium. They go in alphabetical order. The first layer is the Fibrous Pericardium. The second layer is the parietal pericardium and the third and innermost layer is the visceral layer.