The disruption of axons—the thread-like part of nerve cells that transmits electrical signals—is associated with Alzheimer’s disease. One way axonal function may be hindered is through damage to the myelin sheath, a fatty coating that wraps around axons. Similar to the plastic or rubber used to insulate a cable, the myelin sheath allows neurons to quickly communicate with one another. When the structure is impaired, so is the conduction of electrical signals.