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Surrounding each muscle fiber (cell) is a delicate external lamina composed primarily of reticular fibers. This external lamina is produced by the muscle fiber and, when observed through the light microscope, cannot be distinguished from the cell membrane of the muscle fiber, the sarcolemma.
The mesothelium of the serous membrane forms the lining of a closed serous membrane cavity. Serous membrane lining the wall of a serous cavity is designated parietal while that covering viscera is called visceral. Connecting serous membrane runs between parietal and visceral components. The serous membranes are: