2 English reference skeletal muscle
Muscle tissue consisting of skeletal muscle cells. Skeletal muscle is mostly attached to bone, which is the most abundant tissue in the body, accounting for 40% of the body weight. Skeletal muscle cells, also known as muscle fibers, are striated and innervated by somatic nerves, belonging to striated voluntary muscles. Skeletal muscle cells are slender and cylindrical, ranging in length from a few millimeters to dozens of centimeters. They are polynuclear, and the nucleus is located under the sarcolemma. The cytoplasm is called sarcoplasm, which contains a lot of myofibrils. Myofibrils are arranged in parallel with the longitudinal axis of muscle fibers. Among myofibrils, there are thick myofilaments and filaments composed of contractile proteins. The thick and thin filaments in myofibrils are arranged regularly and orderly. Due to the interaction and sliding between thick and thin filaments, muscles contract. In vivo, skeletal muscle fibers gather into muscle bundles, which are wrapped by connective tissue and then assembled into muscle eyes. Both ends of most muscles are connected with tendons, and muscles pass through joints and are attached to bones with tendons. Muscle contraction will affect the activities around bones and joints. All kinds of limb movements of human body are realized by controlling the contraction and relaxation of skeletal muscle through nerves.
The human body has more than 600 muscles, which play different roles in various activities of the body. In the past, the understanding of the function of each muscle was mainly based on anatomical deduction algorithm, and the function of muscle was judged according to the position relationship between the starting and ending points of muscle and its concerns. In recent years, electromyography, combined with telemetry and rapid photography, can be used to measure the simultaneous movement of many muscles in different parts of the human body when doing various exercises, so that the same muscle can play a role in the body.
Our research has reached a new level. Understanding muscle function is essential for the diagnosis, prognosis and treatment of diseases in clinical departments, especially neurology and plastic surgery, and it is also an important basic theory for designing and making artificial limbs, researching and guiding physical training.