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Motor neuron disease is a condition where there is a progressive weakness of many muscles in the body. It is characterized by the inability of a person to control and move his muscles according to his will which leads to muscles weakness with visible muscle wasting.
There are four main types of motor neuron diseases. These are:

Amyotrophic Lateral Sclerosis or ALS

This is the most common form of motor neuron disease. It causes the death of neuron that is responsible for the control of voluntary muscles. Its symptoms include muscle weakness and visible wasting of the muscles. An affected person will start to notice they would trip when walking and cannot stand for long periods of time.

Progressive Bulbar Palsy or PBP

This form commonly affects the vagus nerve, hypoglossal nerve, and the glossopharyngeal nerve. The motor neurons from the cerebral cortex, spinal cord, brain stem, and pyramidal tracts are the ones that are damaged. The disorder is characterized by difficulty in chewing, swallowing, talking

Progressive Muscular Atrophy PMA

Affects the lower motor neurons, which means it is different than the first two and has a much better prognosis than the four types. The disease is characterized by atrophy, fasciculations or muscle twitching and muscle twitching. Though all MNDs have the same symptoms, in PMA the muscles affected are the muscles on the arms and legs. In some cases, just one of the arms or legs is affected.

Primary Lateral Sclerosis PLS

Considered a rare form of motor neuron disease, it only affects the upper motor neurons causing weakness in the muscles of the lower limbs.
Motor neurons are responsible for a lot of important muscles activities in the body which includes, swallowing, breathing, speaking, gripping, walking and a lot more.
There is no specific cause of motor neuron disease. However, experts suggest that it can be hereditary. Faulty genes that are passed down from parents to children could cause the condition.

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If you think you are suffering from Motor Neuron Disease you should seek medical assistance. You may also be entitled to Social Security Disability Benefits. The SSA considered Motor Neuron Disease as a medical condition that would make you eligible for SSDI and SSI. Social Security Administration (SSA) maintains a “Listing of Medical Impairments” (known as the blue book) that automatically qualify you for Social Security Disability Insurance (SSDI) or Supplemental Security Income (SSI).