These are considered lower motor neuron signs.

这些都可以看作下运动神经元征。

ALS affects two types of nerve cells called the upper and lower motor neurons.

ALS影响两种类型的神经细胞，称为上下运动神经元。

If this reflex is absent, it could indicate that you have a lower motor neuron problem.

如果这种反射不存在，它可能表明你的下部运动神经元有问题。

Meanwhile, at the level of lesion, the lower motor neuron of the right ventral horn will also be damaged.

同时，在病变水平，右侧脊髓前角的下运动神经元也会受到损伤。

In other words, there are two upper motor neurons, one from each side of the brain, giving input to one lower motor neuron.

换言之，这里有两种上运动神经元，分别来自大脑两侧，向下运动神经元传导信息。

In a healthy body, the upper motor neurons, which sit in the brain's cortex, transmit messages from the brain to the lower motor neurons, situated in the spinal cord.

在健康的身体中，上部运动神经元位于大脑皮层，将信息从大脑传递到位于脊髓的下运动神经元。

The most common symptoms are weakness or paralysis of both upper and lower facial muscles on one side of the face due to the loss of all lower motor neurons.

最常见的症状是由于失去下运动神经元支配，一侧面部无力或瘫痪。

In a healthy body, the upper motor neurons, which sit in the brain’s cortex, transmit messages from the brain to the lower motor neurons, situated in the spinal cord.

在健康的身体中，位于大脑皮层的上运动神经元将信息从大脑传递到位于脊髓的下运动神经元。

This means that the muscles innervated by these lower motor neurons, like those in the arms, will not receive any neural input at all, so they go limp and decrease in tone, which is called flaccid paralysis.

这意味着由这些下运动神经元支配的肌肉，比如手臂肌肉，无法接收任何的神经信号输入，导致肌肉无力、张力降低，这被称为弛缓性瘫痪（软瘫）。

The one huge difference is that there's another upper motor neuron that extends down from a region in the right motor cortex, and stays on the ipsilateral or same side to meet with same the lower motor neuron.

有一点很不同，即面部右上部分，还有右侧运动皮质发出的上运动神经元，在同侧走行，并与下运动神经元交汇。

An upper motor neuron extends down from the left motor cortex, goes across the midline in the brainstem to the right side, and then meets with a right lower motor neuron which hitches a ride on the right facial nerve.

从左侧运动皮质发出的上运动神经元，在脑干穿过中线到达右侧，然后连接右侧下运动神经元并传导至右侧面神经。