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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.
Each bundle of muscle fiber is called a fasciculus and is. surrounded by a layer of connective tissue called the perimysium. Within the. fasciculus, each individual muscle cell, called a muscle fiber, is surrounded. by connective tissue called the endomysium.