1中枢神经系统肿瘤的发生、危害,建立实验动物模型的必要性中枢神经系统的肿瘤由于病变部位位于人体重要组织器官和枢纽部位,组织学类型多样,部位深在,病变观察困难,患者预后不佳,其危害性大,致残率、致死率高。中枢神经系统肿瘤分为原发性和继发性两大类。原发性肿瘤起源于中 1 The occurrence and harm of central nervous system tumors. The necessity of establishing an experimental animal model. The tumors of the central nervous system are located in the important tissues, organs and hinges of the human body. The histological types are various, the parts are deep, the lesions are difficult to observe, and the prognosis of the patients is not. Good, it has great harm, disability, and high mortality. Central nervous system tumors are divided into primary and secondary categories. Primary tumors originate in