One of the three kinds of connective tissues that exist between the internal layer of deep fascia and the serous membranes lining the body cavities in much the same way as the subcutaneous fascia lies between the skin and the deep fascia: The subserous fasciae is thin in some sections of the body; such as, between the pleura (membrane around the lungs and inner walls of the chest) and the chest wall, and they are thick in other areas, where it forms a pad of adipose tissue where fat is stored.