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A nerve root (latin: radix nervi) is the initial segment of a nerve leaving the central nervous system. Types include: * A cranial nerve root, the beginning of one of the twelve pairs leaving the central nervous system from the brain stem or the highest levels of the spinal cord; * A spinal nerve root, the beginning of one of the thirty-one pairs leaving the central nervous system from the spinal cord. Each spinal nerve root consists of the union of a sensory dorsal root and a motor ventral root. ==Pain and pathologies== Damage to nerve roots can cause paresis and paralysis of the muscle innervated by the affected spinal nerve. It can also cause pain and numbness in the corresponding dermatome. A common cause of damage to the nerve roots are lesions in the spine, such as prolapse of the nucleus pulposus, spinal tuberculosis, cancer, inflammation, spinal tabes. Root pain syndromes, known colloquially as radiculitis, sciatica are one of the most common symptoms caused by damage to the nerve root. Radiculopathy is commonly called the "root". In addition to pain, accompanied by neurological defects. Typically, mechanical dysfunction is caused by pressure on the nerve root or shock can affect both the roots of the lower limbs and arms. Teams root of the upper limbs The first sign of disease, sometimes before a few years, the occurrence of radicular syndrome are pain in the neck and shoulder area. Usually, the pain occurs as a consequence of a cold or hypothermia, sometimes calls it load, poor working posture or sleep, sudden movement of the head. Teams root localized mostly within the three lower cervical roots C5, C6, C7. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nerve root」の詳細全文を読む スポンサード リンク
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