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This same bundles-within-bundles structure is replicated within the muscle cells. Within the cells of the muscle are myofibrils, which themselves are bundles of protein filaments. The term "myofibril" should not be confused with "myofiber", which is a simply another name for a muscle cell. Myofibrils are complex strands of several kinds of protein filaments organized together into repeating units called sarcomeres. The striated appearance of both skeletal and cardiac muscle results from the regular pattern of sarcomeres within their cells. Although both of these types of muscle contain sarcomeres, the fibers in cardiac muscle are typically branched to form a network. Cardiac muscle fibers are interconnected by intercalated discs, giving that tissue the appearance of a syncytium. The filaments in a sarcomere are composed of actin and myosin.

Anatomy.
Histogenesis.
Microanatomy.
Gross anatomy.
Muscular system.
Physiology.
Function.
Energy consumption.
Nervous control.
Efficiency.
Strength.
Health.
Hypertrophy.
Atrophy.
Evolution.
References.