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WORDS THAT ARE UNDERLINED WILL TAKE YOU TO A LINK FOR MORE INFORMATION

M

magnetic resonance imaging (MRI

produces a two-dimensional view of an internal organ or structure. MRIs are very useful when you need images of the soft tissue of the brain and spinal cord

motor neuron diseases 

a group of disorders in which motor nerve cells (neurons) in the spinal cord and brain stem deteriorate and die. ALS is the most common motor neuron disease.

motor neuron

nerve cells that project messages from the central nervous system to muscles. In ALS the motor neurons die which stop sending the messages to the muscles, resulting in paralysis

muscle cramps

involuntary, painful shortening of muscles

muscle weakness

loss of muscle strength with increated fatigue, loss of coordination, difficulty with motor skills, as well as the lack of ability to carry out certain skills 

muscular dystrophy 

the name given to a group of diseases that are, for the most part, genetically determined and which cause gradual weaknessing and muscle changes

myelogram 

a procedure that has dye injected into the spinal canal so that the structure is seen on x-rays

myoclonus 

involuntary movements of the arms and legs A jerking motion that may occur during sleep

Medical Alert System

Communication devices designed to summon help when the user cannot get to a phone. 

N

neuron

a cell specialized to conduct and generate electrical impulses and to carry information from one part of the brain to another

neurosonography 

a procedure that uses ultra high frequency sound waves to reveal patterns of blood flow. This is commonly used to confirm strokes

neurotransmitters

a chemical substance that carries impulases from one nerve cell to another

norepinephrine 

a neurotransmitter found mainly in areas of the brain that are involved in the nervous system activity such as blood pressure and heart rate

nerve conduction 

a test for nervce damage

neuromuscular junction (NMJ)

a connection between the motor nerves and skeletal muscles. In ALS, the connection becomes weak and deterioates