The cytoskeleton is composed of three well defined filamentous structures- microtubles: 25 nm in diameter; microfilaments, 7 to 9 nm in diameter; and intermediate filaments. 10 nm in diameter-that together form an elaborate interactive network, which is also associated with the nuclear matrix and cytoplasm membrane. They are a highly dynamic group of structures capable of rapid and dramatic reorganization. In addition, many of functions of the cytoskeleton require a host of accessory proteins, which may are not a part of the filaments themselvesThe cytoskeleton is composed of three well￾defined filamentous structures- microtubles, 25 nm in diameter; microfilaments, 7 to 9 nm in diameter; and intermediate filaments, 10 nm in diameter-that together form an elaborate interactive network, which is also associated with the nuclear matrix and cytoplasm membrane. They are a highly dynamic group of structures capable of rapid and dramatic reorganization. In addition, many of functions of the cytoskeleton require a host of accessory proteins, which may are not a part of the filaments themselves