What is "motor neuron disease"

alt. (context disease neurology English) Any of a group of progressive neurological disorders attacking motor neurons. n. (context disease neurology English) Any of a group of progressive neurological disorders attacking motor neurons.

A motor neuron disease, also spelled motor neurone disease (MND) is any of five neurological disorders that selectively affect motor neurons, the cells that control voluntary muscles of the body. These five conditions are amyotrophic lateral sclerosis, primary lateral sclerosis, progressive muscular atrophy, progressive bulbar palsy and pseudobulbar palsy. They are neurodegenerative in nature and cause increasing disability and eventually, death.