神经系统(nervous system)
特化的细胞系统（神经元或神经细胞），负责将自感觉受器中接收的刺激经由神经元的网络传递至产生反应动作的地方（例如腺体或肌肉）。在人类体内包括中枢神经系统和周围神经系统，前者由脑和脊髓组成，而後者则由将冲动传入或传出中枢神经系统的神经所组成。颅神经与头、颈部的感觉和活动有关，仅迷走神经是为例外，该神经负责传递信号至内脏器官。每一脊神经都以感觉纤维（背侧根）和运动纤维（腹侧根）连接於脊髓上。脊神经由椎间孔出椎管，联合组成大型混合性神经，再分支以支配身体特定部位。神经系统障碍包括肌萎缩性侧索硬化、舞蹈病、癫痫、重症肌无力、神经管缺陷、帕金森氏症和小儿麻痹症。神经系统障碍所造成的影响从短暂的抽搐、轻微的人格变化到重大的人格分裂、疾病发作、瘫痪和死亡不等。
English version：
nervous system
System of specialized cells (neurons, or nerve cells) that conduct stimuli from a sensory receptor through a neuron network to the site (e.g., a gland or muscle) where the response occurs. In humans, it consists of the central and peripheral nervous systems, the former consisting of the brain and spinal cord and the latter of the nerves, which carry impulses to and from the central nervous system. The cranial nerves handle head and neck sensory and motor activities, except the vagus nerve, which conducts signals to visceral organs. Each spinal nerve is attached to the spinal cord by a sensory and a motor root. These exit between the vertebrae and merge to form a large mixed nerve, which branches to supply a defined area of the body. Disorders include amyotrophic lateral sclerosis, chorea, epilepsy, myasthenia gravis, neural tube defect, parkinsonism, and poliomyelitis. Effects of disorders range from transient tics and minor personality changes to major personality disruptions, seizures, paralysis, and death.