A type of intermediate filament found in the core of neuronal axons. Neurofilaments are heteropolymers composed of three type IV polypeptides: NF-L, NF-M, and NF-H (for low, middle, and high molecular weight). Neurofilaments are responsible for the radial growth of an axon and determine axonal diameter. [ https://www.worldcat.org/search?q=bn%3A0716731363 https://www.worldcat.org/search?q=bn%3A0198506732 https://www.worldcat.org/search?q=bn%3A0815316194 ]