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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.
eÂ·lasÂ·tic fiÂ·bers. Fibers that are 0.2-2 mcm in diameter but may be larger in some ligaments; they branch and anastomose to form networks and fuse to form fenestrated membranes; the fibers and membranes consist of microfibrils about 10 nm wide and an amorphous substance containing elastin. Synonym(s): yellow fibers.