Intermediate filaments are about 10 nm in diameter and are more stable than microfilaments. They provide mechanical strength to cells and help maintain their integrity. Intermediate filaments are composed of a diverse group of proteins, including keratins in epithelial cells, vimentin in mesenchymal cells, and neurofilaments in neurons. These filaments form a network that extends from the cell membrane to the nucleus, providing structural support and resistance to mechanical stress.
