disease of the brain and spinal cord caused by an unknown agent that gradually destroys the myelin covering, or sheath, of nerve fibers, resulting in a temporary interruption or disordered transmission of nerve impulses, particularly in pathways concerned with vision, sensation, and the use of limbs; disruption of impulse transmission may cause mild to moderate symptoms (numbness in the limbs to complete and permanent paralysis); onset generally occurs between ages 20 and 40, with symptoms appearing at irregular intervals for years
A disease affecting the nervous system usually with a relapsing and remitting pattern (at times the symptoms are severe, while at other times they seem to disappear). Movement, vision, speech and memory may be affected.
a disease in which a loss of a substance around nerve fibers in the brain and/or spine causes motor difficulties. MS is a progressive disease of the central nervous system characterized by destruction of myelin (demyelination), the fatty substance that forms a protective sheath around certain long nerve fibers (axons). Myelin serves as an electrical insulator, enabling the effective transmission of nerve signals. Patients with MS may develop paresthesias, such as numbness or tingling; muscle weakness and stiffness; impaired coordination; abnormal reflexes; an inability to control urination (urinary incontinence); slurred speech; visual disturbances; and/or other symptoms and findings.