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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.
Endomysium is made from the protein callogen. It is vital in the process of all muscle functions. The blood vessels within the endomysium supply the muscle cells with the oxygen required to function properly. Muscle fiber cell membranes are called sarcolemma and are within the endomysium. Bundles of muscle fibers are called fasicles and are bound together by an outter layer of connective tissue called the perimysium. The entire muscle is wrapped in another type of connective tissue called epimysium.