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| Neuromuscular diseases ： ウィキペディア英語版 |
Neuromuscular disease
Neuromuscular disease is a very broad term that encompasses many diseases and ailments that impair the functioning of the muscles, either directly, being pathologies of the muscle, or indirectly, being pathologies of nerves or neuromuscular junctions.
Neuromuscular diseases are those that affect the muscles and/or their direct nervous system control. In general, problems with central (or upper motor neuron) nervous control can cause either spasticity (from upper motor neuron conditions) or some degree of paralysis (from both lower and upper motor neuron disorders, upper motor neuron conditions usually being associated with concurrent hyperreflexia), depending on the location and the nature of the problem. A large proportion of neurological disorders leads to problems with movement. Some examples of central (or upper motor neuron) disorders include cerebrovascular accident (stroke), Parkinson's disease, multiple sclerosis, Huntington's disease (Huntington's chorea) and Creutzfeldt–Jakob disease. Spinal muscular atrophies are disorders of lower motor neuron while amyotrophic lateral sclerosis is a mixed upper and lower motor neuron condition. Neuropathies involve dysfunction of the peripheral nerves, which consist of: motor neurons, which carry the electrical signals directly from the spinal cord and brain stem to activate muscle movement; the sensory neurons which convey sensory information such as pain, temperature, light touch, vibration and position to the brain; and the autonomic neurons which go to the internal organs and control blood vessel reflexes. Myasthenia gravis and Lambert–Eaton syndrome are examples of neuromuscular junction disorders. Muscular dystrophies and inflammatory myopathies such as polymyositis are examples of primary muscular (myopathic) disorders.
==Symptoms and testing==
Symptoms of muscle disease may include muscular weakness, rigidity, loss of muscular control, myoclonus (twitching, spasming), and myalgia (muscle pain). Diagnostic procedures that may reveal muscular disorders include direct clinical observations. This usually starts with the observation of bulk, possible atrophy or loss of muscle tone. Neuromuscular disease can also be diagnosed by testing the levels of various chemicals and antigens in the blood, and using electrodiagnostic medicine tests including electromyography (measuring electrical activity in muscles) and nerve conduction studies. Diagnostic imaging may be helpful in certain cases, such as those caused by strokes or tumors. Genetic testing is an important part of diagnosing inherited neuromuscular conditions.
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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