An<unk>  is a<unk>  of the neural pathway above the anterior horn cell or motor nuclei of the cranial nerves. This is in contrast to a lower motor neuron<unk> , which affects nerve fibers traveling from the anterior horn of the spinal cord to the relevant muscle(s).
Upper motor neuron lesion
Lower motor neuron lesion
Motor neuron disease
Hereditary motor and sensory neuropathy
Neuromuscular junction disease
Basal ganglia disease
Spinal cord tumor
Adrenomyeloneuropathy