神经系统变性的疾病通常是指一些属于神经系统慢性衰变的疾病,病因不明。因常呈遗传或家族发病的形式,故也叫遗传性或遗传性家族性变性疾病。病变特征为:选择性地侵犯解剖上及生理上有关的神经元系统,神经细胞及其树状突、轴束与髓鞘均有消失,不伴强烈的组织反应及细 Nervous system degenerative diseases are usually refers to some of the nervous system chronic decay disease, the etiology is unknown. Due to the often genetic or familial disease form, it is also called hereditary or hereditary familial degenerative diseases. Lesions are characterized by: selective invasion of anatomically and physiologically related neuronal systems, nerve cells and dendrites, shaft bundle and myelin have disappeared, without strong tissue reaction and fine