Neurofilament

Part of speech: noun

Definitions

1. A type of intermediate filament that provides structural support to neurons and helps maintain their shape
2. A crucial component of the cytoskeleton in nerve cells that plays a role in intracellular transport and stability
3. A protein filament found in the axons of neurons, contributing to the mechanical properties and integrity of neural tissues

Etymology: Neurofilament is a compound built from two parts with very different histories. The first, "neuro-", comes from Ancient Greek "neûron", meaning sinew, tendon or nerve, a word that originally referred to the stringy, fibrous tissues of the body rather than to the nervous system as such. Modern scientists took the combining form "neuro-" from that Greek root to mean "nerve", so the prefix carries the idea of cords and fibres. The second part, "filament", is the more surprising one. It descends from Latin "fīlum", thread, which traces back to an Indo-European root for twisting or spinning fibre, so the whole word is essentially "nerve thread". Medieval Latin developed "fīlāmentum" from the same stem, and English adopted "filament" from it. The filament sense that most people know, the wire in a light bulb, is a later extension of that thread idea. Neurofilaments are named for their appearance under the microscope: they are thread-like protein strands running along the length of axons, and their name combines the nerve root with the thread root.

Synonyms: axon filament, intermediate filament