Mesothelium is the layer of flat cells, derived from the mesoderm, that lines the body cavity of the embryo.
Malignant mesothelioma is a cancer that starts in cells in the linings of certain parts of the body, especially in the linings of the chest or abdomen.
Mesothelium cells are actually known as mesothelial cells. These cells line on the inside of the chest, the abdomen, and the space around your heart. These cells also cover the outer surface of most of your internal organs. The lining formed by these cells is called the mesothelium.
The mesothelium is vital in that it helps protect your organs by making a special lubricating fluid that allows organs to move around. The Mesothelium fluid helps protect your organs by making a special lubricating fluid that allows organs to move against each other without friction. This fluid makes it easier for organs like the lungs to move, that is expand and contract inside the chest when one breathes