Skeletal muscles are the most common of the three types muscle in the body. They are attached to bones by tendons，a kind of dense connective tissue and produce contract as well as exact movements under the voluntary control of our nerves. Skeletal muscles also help us to hold the body upright or balance in positions by resisting gravity. Different skeletal muscles come in different shapes and sizes whereas they keep the same in the organization structure. A skeletal muscle surrounded by epimysium consists of multiple bundles of fascicle. A muscle fascicle wrapped by perimysium may be made up of bundles of muscle fibers. Inside each fascicle, muscle fibers are encased by endomysium individually. Each muscle fiber contains hundreds, thousands of myofibrils. Furthermore, nerves and blood vessels bind together with muscle fibers which complete the corresponding works of skeletal muscle. Disorders in skeletal muscle result in the enabled actions of the body. Some target molecules could be used to detect the relevant diseases on skeletal muscles.
