Mononucleate, satellite cells , associate with the muscle fiber and reside within the muscle basal lamina. They promote limited regeneration of muscle in the adult. Structure of striated muscle cells. Skeletal muscle structure is an outstanding example of how function follows from structure. While the muscle fiber structure is highly organized and easy to understand, the terminology is difficult.
Muscle fibers contain many myofibrils , which are organized arrays of myofilaments .
Myofilaments are molecular filaments of two types. Thick filaments, which are composed principally of myosin, and thin filaments, which are composed principally of actin. Each myosin molecule contains 2 myosin heavy chains and 2 pairs of light chains. The light chains comprise the molecular heads. The myosin molecules associate by means of their tails to form the thick filaments.