Lower motor neurons are in your brain stem and spinal cord. ... Upper motor neuron lesions prevent signals from traveling from your brain and spinal cord to your muscles.

This will determine whether you have an upper motor neuron disorder or a lower motor neuron disorder. From there, they’re likely to perform tests on your stretch reflex .

Areflexic, or flaccid, bladder and bowels occur when the spinal cord injury is low enough to damage the cauda equina and alpha motor neurons. It also occurs in all spinal cord injury patients during ...

In the milder cases electromyographic sampling may demonstrate the characteristic pattern of lower-motor-neuron denervation — namely, polyphasic motor units or fibrillations.