运动失调是指小脑及其相关的脊髓、脑干部的神经发生障碍而引起颤动、眩晕等平衡障碍及舌失灵、手不能定位运动等运动障碍。因此,无论血栓、肿瘤如果侵犯这些部位都易出现运动失调症。而病因疾病在神经系统以外的称为继发性运动失调症,与病因在神经细胞本身的亦即脊髓小脑变性症(SCD)加以区别。但是一般所说运动失调是指这种SCD,因此这里也以SCD 为主进行阐述,对继发性运动失调症仅扼要叙述。SCD 是小脑、脑干部、脊髓的神经逐渐坏死脱落,即在病理上陷于所谓“变性”状态的病因不明的神经疾病。 Motor disorders refers to the cerebellum and its associated spinal cord, brain stem nerve disorders caused by fibrillation, dizziness and other disorders and the failure of the tongue, hand movement can not locate movement disorders. Therefore, regardless of thrombus, tumor invasion of these sites are prone to exercise disorders. The etiology of the disease outside the nervous system is called secondary motor disorder, and the cause of the nerve cell itself, namely, spinocerebellar degeneration (SCD) to be distinguished. However, the so-called movement disorders are generally referred to as SCD, so here is also described mainly SCD, only brief narration of secondary motor disorders. SCD is the cerebellum, brain stem, spinal nerve gradually necrosis, that in the pathological trapped in the so-called “degeneration” of unknown etiology of nerve disease.