They are in charge of the knee and ankle reflexes.

这些神经还负责膝盖和脚踝反射。

First, the ankle reflexes are lost, and soon after the patellar and arm reflexes are lost as well.

最先消失的是踝反射，然后是膝反射，最后手臂反射也会消失。

One or both legs can be impaired by muscle weakness, loss of knee and ankle reflexes, and even paraplegia, which is when the affected person loses all feeling and muscle control in the legs.

它也会导致一条或两条腿肌肉无力、膝盖和脚踝反射丧失，甚至是截瘫，即患者失去所有腿部肌肉的运动和感觉功能。