Muscle structure refers to the organization of muscle tissue at the microscopic level, including the arrangement of muscle fibers, myofibrils, and other cellular components. Understanding muscle structure is important for studying muscle function, physiology, and mechanics, as well as for diagnosing and treating muscle-related disorders and injuries. Research in muscle structure often involves techniques such as microscopy, biochemistry, and molecular biology to examine the organization and composition of muscle tissue at various scales. This research area is multidisciplinary and can encompass a wide range of topics, including muscle development, muscle aging, muscle diseases, and muscle repair and regeneration.