A<unk>  is a lesion which affects nerve fibers traveling from the<unk>  motor neuron(s) in the anterior horn/anterior grey column of the spinal cord, or in the motor nuclei of the cranial nerves, to the relevant muscle(s). One major characteristic used to identify a<unk>  is flaccid paralysis – paralysis accompanied by loss of muscle tone. This is in contrast to an upper motor neuron lesion, which often presents with spastic paralysis – paralysis accompanied by severe hypertonia.
Lower motor neuron lesion
Upper motor neuron lesion
Accessory nerve disorder
Motor neuron disease
Vascular myelopathy
Upper motor neuron syndrome
Hereditary motor and sensory neuropathy
Subacute combined degeneration of spinal cord