Muscle compartments are groups of muscles, nerves, and blood vessels that are enclosed by a tough layer of connective tissue called fascia. These compartments help organize the muscles in the body, allowing them to work together efficiently. Each compartment typically contains a specific set of muscles that perform similar functions, such as flexing or extending a joint. In the limbs, muscle compartments are important for movement and stability. For example, the anterior compartment of the thigh contains muscles like the quadriceps, which are responsible for extending the knee. Understanding muscle compartments is crucial for diagnosing injuries and planning surgical procedures.