The answer is skeletal muscles. Skeletal muscle—multinucleated, striated, long cylindrical cells called fibers; located in deltoid, gastrocnemius, biceps brachii, etc. There are three types of muscle tissue. Skeletal muscle—multinucleated, striated, long cylindrical cells called fibers; located in deltoid, gastrocnemius, biceps brachii, etc. Smooth muscle—no striations, spindle-shaped cells, single nucleus located centrally; located in wall of arteries, arrector pili muscle, iris, walls of hollow organs.