Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
The Node of Ranvier is a small gap in the myelin sheath of a nerve fiber, allowing for the rapid conduction of nerve impulses. It plays a critical role in the propagation of action potentials along myelinated neurons.
A fatty layer that surrounds nerves, providing insulation and increasing the speed at which impulses propagate along the nerve fiber.
Action potential: A temporary reversal in the electrical polarization of the membrane of a neuron or muscle cell, allowing for communication between cells.