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paralysis
Paralysis is loss of muscle function for one or more muscles. Paralysis can be accompanied by a loss of feeling (sensory loss) in the affected area if there is sensory damage as well as motor. About 1 in 50 people have been diagnosed with some form of paralysis, transient or permanent. The word comes from the Greek παράλυσις, "disabling of the nerves",〔 on Perseus〕 itself from παρά (''para''), "beside, by" and λύσις (''lysis''), "loosing" and that from λύω (''luō''), "to loose". A paralysis accompanied by involuntary tremors is usually called "palsy".〔(【引用サイトリンク】title=Palsy )〕〔(【引用サイトリンク】title=Palsy )〕
==Causes==
Paralysis is most often caused by damage in the nervous system, especially the spinal cord. Other major causes are stroke, trauma with nerve injury, poliomyelitis, cerebral palsy, peripheral neuropathy, Parkinson's disease, ALS, botulism, spina bifida, multiple sclerosis, and Guillain-Barré syndrome. Temporary paralysis occurs during REM sleep, and dysregulation of this system can lead to episodes of waking paralysis. Drugs that interfere with nerve function, such as curare, can also cause paralysis. There are many known causes for paralysis, and perhaps more yet to be discovered.
''Pseudoparalysis'' (''pseudo-'' meaning "false, not genuine", from Greek ψεῦδος) is voluntary restriction or inhibition of motion because of pain, incoordination, orgasm, or other cause, and is not due to actual muscular paralysis.〔(TheFreeDictionary > pseudoparalysis ), in turn citing The American Heritage Medical Dictionary 2007, 2004〕 In an infant, it may be a symptom of congenital syphilis.
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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