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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 plasma membrane of muscle fibers is known as the sarcolemma. Each muscle is made up of bundles of these fibers, or cells, embedded in a matrix of connective tissue known as the endomysium. The bundle of fibers with its endomysium is surrounded by a more fibrous connective tissue sheath known as the perimysium.