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| Ocular myasthenia ： ウィキペディア英語版 |
Ocular myasthenia
Ocular myasthenia gravis (MG) is a disease of the neuromuscular junction resulting in hallmark variability in muscle weakness and fatigability. MG is an autoimmune disease where anomalous antibodies are produced against the naturally occurring acetylcholine receptors in voluntary muscles. MG may be limited to the muscles of the eye (ocular MG), leading to abrupt onset of weakness/fatigability of the eyelids or eye movement. MG may also involve other muscle groups (generalized MG).
==Pathophysiology==
Normally, muscle contraction is a result of electrical signals sent from the central nervous system to muscle fibers via nerve impulses. At the neuromuscular junction, this electrical message is converted into a chemical message as acetylcholine is released from nerve fibers and attaches to corresponding receptors on the muscle fiber.
In MG, antibodies are produced that block acetylcholine receptors, preventing the molecule from binding to the receptor and leading to a breakdown in communication between the nervous system and the muscle, resulting in muscle fatigue, and sometimes paralysis. Autoantibodies against acetylcholine receptors are detectable in 70–90% of patients with generalized MG, but only 50% in ocular MG.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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