Motor Cortex: The region of cerebral cortex that controls the action of the body's voluntary muscles.
运动皮层：大脑皮层中控制身体随意肌活动的区域。
Motor Neuron: Neuron that carries messages away from the central nervous system toward the muscles and glands.
运动神经元：将信息从中枢神经系统传递到肌肉和腺体的神经元。
Myelin Sheath: Insulating material that surrounds axons and increases the speed of neural transmission.
髓鞘：包裹着轴突并提高神经传输速度的绝缘材料。
Narcolepsy: A sleep disorder characterized by an irresistible compulsion to sleep during the daytime.
突发性睡眠症：以白天无法抵抗的强制的睡眠为特征的睡眠障碍。
