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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 muscle fibers bound together by the endomysium form a bundle called a fascicle. The fascicles are surrounded by connective tissue containing collagen and elastic fibers that supports the blood vessels and nerves that serve the fibers of the fascicles.This connective tissue is called the perimysium. 3. Epimysium.he thick filaments are linked in the center of the sarcomere by proteins that form the M line. At either end of the sarcomere, the actin filaments are attached to one another by proteins that form the Z line.