<Ul> <Li> blurriness in the central visual field that affects only one eye, may be accompanied by pain upon eye movement </Li> <Li> double vision </Li> <Li> loss of vision / hearing </Li> <Li> odd sensation in legs, arms, chest, or face, such as tingling or numbness (neuropathy) </Li> <Li> weakness of arms or legs </Li> <Li> cognitive disruption, including speech impairment and memory loss </Li> <Li> heat sensitivity (symptoms worsen or reappear upon exposure to heat, such as a hot shower) </Li> <Li> loss of dexterity </Li> <Li> difficulty coordinating movement or balance disorder </Li> <Li> difficulty controlling bowel movements or urination </Li> <Li> fatigue </Li> <Li> tinnitus </Li> </Ul> <Li> blurriness in the central visual field that affects only one eye, may be accompanied by pain upon eye movement </Li> <Li> loss of vision / hearing </Li> <Li> odd sensation in legs, arms, chest, or face, such as tingling or numbness (neuropathy) </Li>

Function of the myelin sheath in a neuron