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A skeletal muscle contracts only when stimulated by nerve impulses from a motor neuron. Without innervation, muscles become paralyzed and eventually atrophied. The axon of a motor neuron usually gives out many branches, supplying multiple muscle fibers. These fibers contract in unison when activated, and constitute a motor unit. A motor unit can contain anywhere from just a few muscle fibers, to thousands of them. Small motor units are found in muscles that require finer control, for example, muscles that are responsible for subtle movements of the eyes. Large motor units are found in larger muscles that require strength, such as muscles of the arms and legs. Muscle fibers of the same motor unit are usually not clustered together, but scattered throughout the muscle. This way, stimulation of a motor unit has a slight but uniform effect on the whole muscle, and not causing a small localized twitch. The strength of a muscle contraction is determined by the number of motor units that are
