Node of Ranvier

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.

Related terms

Myelin Sheath: 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.

Axon: A long, slender projection of a neuron that conducts electrical impulses away from the neuron's cell body