There were large amount of serious fibrino and suppurative fibrino exudation on the serosa of liver hepar, lung, spleen, parietal layer and visceral layer of pericardium.
In chronic pericarditis, immune cells start to recruit fibroblasts which create lots of fibrin - a protein that makes the serous pericardium stiffer - a bit more like the fibrous pericardium.
Meanwhile, the inner serous pericardium consists of an inner visceral layer, or epicardium — which is actually part of the heart wall — and an outer parietal layer.
The tough outer layer, or fibrous pericardium, is made of dense connective tissue and helps protect the heart while anchoring it to some of the surrounding structures, so it doesn't like bounce all over the place while beating.
The cells of the serous pericardium secrete and reabsorb the fluid, so usually there's no more than 50 milliliters of fluid in the pericardial cavity at one time - that's about as much as a shot glass.
The high levels of urea irritate the serous pericardium, making it secrete a thick pericardial fluid that's full of fibrin strands and white blood cells.
When the pericardium is involved, it often leads to pericarditis —inflammation of the pericardium— and pericardial effusion, an accumulation of fluid in the pericardial cavity.
医学百科 The Medicine Book (Big Ideas Simply Explained)
The yin organs, the heart, spleen, lungs, kidney, liver and pericardium, a thin sac around the heart, are seen as solid, with functions that include regulating and storing key substances such as blood and qi.