muscle fibers contain cylindrical structures called myofibrils, which are composed of Skeletal- Gross Anatomy
The thin and thick myofilaments that make up the myofibrils are what give it muscle the striped appearance.Along with 2 other muscle regulating proteins, tropomyosin and troponin, the thick filaments are made up of strands of the protein myosin, while the thin filaments are made up of strands of the protein actin.
The layer or connective tissue known as the perimysium surrounds each bundle or muscle fibers, in which fasciculi are referred to.The fasciculus' endomysium, a connective tissue, surrounds each muscle fiber fiber or muscle cell.
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