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muscle cell-an elongated contractile cell that forms the muscles of the body. muscle fiber, muscle fibre. fibre, fiber-any of several elongated, threadlike cells (especially a muscle fiber or a nerve fiber).
More about the contents of cells generally, is available on the page about animal cells. The components of skeletal muscle cells that are specific to muscle tissue are myofibrils. 1  Each muscle fibre ( muscle cell ) is covered by a plasma membrane sheath which is called the sarcolemma.ore about the contents of cells generally, is available on the page about animal cells. The components of skeletal muscle cells that are specific to muscle tissue are myofibrils. 1  Each muscle fibre ( muscle cell ) is covered by a plasma membrane sheath which is called the sarcolemma.