Skeletal muscle fibres (cells) are multinucleated; Filled with myofibrils, a longitudinally arrayed subunits. These myofibrils are made up of the myofilaments: myosin (thick) filaments, and actin (thin )filaments in which their arraignment is reflected by the striations. A myofibril consists of many sarcomeres, individual contractile units, end to end. The entire skeletal muscle exhibits cross-striations. The alternating pattern of light and dark bands, respectively called I and A bands, are the most obvious feature in longitudinal sections of skeletal muscle. I band is bisected by the Z line, dense zone, to which the actin filaments of I band are attached.
