The endomysium is the protective covering of connective tissue that surrounds each individual muscle fiber. Blood vessels, or capillaries, nerves and lymphatics also make up this layer.
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.