Once your brain receives sensory information, it sends a motor signal down the upper motor neurons through the corticospinal tract in the midbrain, and cross to the opposite side at the medulla before continuing down the spinal cord.

当大脑接收到感觉信息时，它通过中脑的皮质脊髓束向上运动神经元发送运动信号，先交叉至对侧延髓，然后继续下行。