The authors explain that in a standard blow-hole colostomy, the omentum and seromuscular layers of the colon are sutured to the peritoneum and the rectus fascia.
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.
Okay, so the intestinal wall, like this one, has lots of ridges and grooves, and also can be separated into the mucosal layer, submucosal layer, muscle layer, and serosa.
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.
The inner layer of the pouch is the serous pericardium that includes the pericardial cavity, and is filled with a small amount of fluid that lets the heart slip around as it beats.
This is similar to tamponade physiology but happens more gradually and is a result of a change in the composition of the serous pericardium, rather than a fluid collection around the serous pericardium.
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.
But of course it's much more than just a storage tank — it's lined with the same four main layers found through most of the GI tract — the mucosa, submucosa, muscularis externa, and serosa — but it's got a few special modifications.