UNMYELINATED AXON

• WHAT DOES THE MYELIN DO?

  act as an electrical insulator and prevent action potentials from forming
• WHAT ARE FOUND ALONG THE MYELIN SHEATH?

  nodes of Ranvier (at 1 - 3 mm intervals)
• WHAT HAPPENS AT NODES OF RANVIER?

  action potentials occur here and jump from node to node (saltatory conduction)
• WHAT DO ACTION POTENTIALS AT NODES OF RANVIER LEAD TO?

  localised circuits
• PURPOSE OF THE MYELIN SHEATH?

  allow action potential to pass along axon faster as depolarisation takes less time