The muscular system is the bodily system that is composed of the muscles and serves the purpose of the movement of the body.
Medical doctors often opt for inter-muscular injections instead of intravenous in Andorians because of their unique physiology. (TOS: "Whom Gods Destroy")
The prepared flesh and muscle of an animal, that is often used as food, is called meat. (TAS: "The Slaver Weapon", etc.)
Referenced parts of the system