Here's how it works:
* Myelin Sheath: This is a fatty, white substance that wraps around the axon of a neuron (the long, thin part that carries the electrical signal). It's like a layer of insulation around a wire.
* Saltatory Conduction: The myelin sheath creates gaps called nodes of Ranvier along the axon. The electrical signal "jumps" from one node to the next, instead of traveling continuously down the entire length of the axon. This is called saltatory conduction.
* Faster Transmission: This jumping action is much faster than the continuous transmission of a signal along an unmyelinated axon. Think of it like a car driving along a highway with occasional toll booths. It's quicker to jump through the toll booths than to slow down at each one.
In summary: The myelin sheath acts as an insulator, preventing the signal from leaking out and allowing it to jump between nodes of Ranvier, thus greatly increasing the speed of electrical transmission.
