A bezel is a narrow piece of metal used to hold a gem in place on a piece of jewelry. The bezel surrounds the gemstone all the way around. A bezel is also the part of the watch surrounding the crystal on a watch face that holds the crystal in place. Bezels may or may not be set with gems and may or may not be textured.
The lungs are surrounded by a double membrane called pleura. This membrane has two layers, a parietal pleura and a visceral pleura. The parietal pleura is attached to the chest wall and the visceral pleura covers the surface of the lungs.Between these layers of pleura is a potential space i.e. a space that doesnât exist but it could exist if something goes wrong.his membrane has two layers, a parietal pleura and a visceral pleura. The parietal pleura is attached to the chest wall and the visceral pleura covers the surface of the lungs.
Each pleural cavity is lined by a pleural membrane that is composed of two layers. The visceral pleura surrounds the outside of the lung. The parietal pleura lines the inside of the chest wall and extends over the diaphragm.These membranes secrete a lubricating fluid, which allows for free movement of the lungs against the chest wall when we breathe.ach lung is contained within a pleural cavity. Each pleural cavity is defined by a space surrounding each lung and is lined by a pleural membrane. The pleural membrane is made up of two layers. These layers can be illustrated in a transverse section of the thoracic cavity.