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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 reticular membrane (RM, also called reticular lamina or apical cuticular plate) is a thin, stiff lamina that extends from the outer hair cells to the Hensen's cells. The RM is composed of minute-fiddle-shaped cuticular structures called the phalangeal extensions of the outer hair cells, interspaced with extensions coming from the outer phalangeal cells.