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Muscle Cell Picture
Muscle is composed of muscle cells (sometimes known as "muscle fibers").
Within the cells are myofibrils; myofibrils contain sarcomeres, which are composed of
actin and myosin. Individual muscle cells are lined with endomysium. Muscle cells are
bound together by perimysium into bundles called fascicles; the bundles are then grouped
together to form muscle, which is lined by epimysium. Muscle spindles are distributed
throughout the muscles and provide feedback sensory information to the central nervous
system.

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