Myelin Damage in Multiple Sclerosis. Image Courtesy of Mayo Clinic (image) University of Chicago Medical Center Share Print E-Mail Caption In healthy myelinated neurons, potassium channels are usually buried underneath the myelin sheath. When there is loss of myelin, these channels become exposed and leak intracellular potassium. This leaves them unable to propagate electrical impulses. Credit Image courtesy of Mayo Clinic Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.