As seen in the transverse section,the gray matter of the spinal cord lies centrally and has a roughly Hshaped or butterfly outline. The small central canal is located in the center of the spinal cord.Thin dorsal and ventral gray commissures surround the c...[继续阅读]

    or named Bournevillesdisease,is a hereditary disease with autosomal dominant fashion. Clinically,it is characterized by the sebaceous adenoma onthe face,onset of epilepsy and intellectualdeficiency,and may be accompanied by the variable abnormal changes o...[继续阅读]

    系指外周神经、脊髓 后索的变性性疾病。是由于胃内因子 (Castle因子)缺乏和维生素B12吸收不良引 起的,通常伴有恶性贫血。其临床特征是肌强 直、共济失调、外周神经功能障碍。...[继续阅读]

    位于舌下神经核的背外, 侧,其上、下端略超过舌下神经核。主 要由小梭形细胞组成,发出副交感神经节前 纤维行向腹外侧,在橄榄后沟上部出脑,组成 迷走神经运动根。...[继续阅读]

    maidism,is a disease causedby deficiency of vitamine B complex,spe cially niacin. It is characterized by dermitis,glossitis,diarrhea and cerebromyelic or peripheral nerve degeneration. Defi ciency of niacin may be caused by malnutrition,absorbing dysfunct...[继续阅读]

    lies be neath the facial colliculus in the rhomboidfossa,extending superiorly from the plane of the lower end of the motor nucleus of the trigeminal nerve to the rostral part of the motor nucleus of the facial nerve inferiorly. It is composed of small,med...[继续阅读]

    由交感干神经节发出返回脊 神经的节后纤维组成,因无髓鞘,色泽 灰暗而得名。这些纤维进入脊神经后,随之分 布至竖毛肌、汗腺和血管。灰交通支存在于全 部脊神经与交感干神经节之间。...[继续阅读]

    Some patients have prodromes prior to the onset of their convulsions. The most common manifestation is a series of short minor attacks early in the day followed by a majortonicoclonic seizure later. Then,loss of con sciousness appears and usually precedes...[继续阅读]

    是由与轴突平行的双分子脂质层同蛋白质分子交替构成的。因此,髓 磷脂实际上是多层经过改造的细胞膜组成。 施兰切迹是雪旺细胞的细胞质围着轴突缠绕 的过程中被留在髓磷脂层内的部分。...[继续阅读]

    系由于脑动脉血栓形成引 起脑动脉梗塞而产生局灶性神经症。 该病的常见病因为脑动脉粥样硬化、高血压、 糖尿病及黄瘤病等。60岁以上患者多见,大多 于睡眠、安静状态下或起立时发病。临床特征 包括:意识相对清晰,脑脊液正常...[继续阅读]