propagation of action potentials in myelinated neurones

• the rate at which action potentials are transmitted is faster in myelinated neurones
• myelinated neurones are insulated by a fatty acid substance called myelin sheath. action potentials can not be set up or propagated in these areas
• the areas which aren't covered by myelin sheath are called nodes of ranvier. it is these areas where action potentials can be set up and propagated
• action potentials 'jump' from one node to the next. this is called saltatory conduction