Ranvier's node
[/ˈrɑːnvieɪz nəʊd/]
nounpl: Ranvier's nodes
nó de Ranvier
1. A gap in the myelin sheath along an axon where the axon membrane is exposed; a region of unmyelinated axon between successive internodes that allows for saltatory conduction
Action potentials jump from one Ranvier's node to the next, greatly increasing the speed of nerve impulse transmission.
Os potenciais de ação pulam de um nó de Ranvier para o próximo, aumentando muito a velocidade de transmissão do impulso nervoso.
2. In neuroanatomy, the periodic constrictions of the axon sheath formed by gaps between myelin-producing cells
The distance between successive Ranvier's nodes varies depending on the diameter of the axon and the type of nerve fiber.
A distância entre nós de Ranvier sucessivos varia dependendo do diâmetro do axônio e do tipo de fibra nervosa.
This is a technical anatomical term named after French histologist Louis-Antoine Ranvier who first described these structures in the 19th century. It is used universally in medical education, neuroscience, and biology courses across both Brazil and Portugal. The term is not subject to regional variation as it is standardized scientific nomenclature.
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