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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.
Connective Tissue Components. The highly specialized skeletal muscle cells, or muscle fibers, are covered by a delicate connective tissue membrane called the. endomysium (Figure 10-1). Groups of skeletal muscle fibers, called fascicles, are then bound together by a tougher connec-. tive tissue envelope called the perimysium.