Motor Neuron Disease

Neurologists in the 19th century recognized that muscle weakness could be due to primary disorders of muscle or secondary to loss of neuromuscular integrity, as happens when peripheral nerves are cut or when motor neurons degenerate. Furthermore, it was observed that there are forms of motor neuron degeneration which selectively affect upper motor neurons or lower motor neurons. A combination of upper and lower motor neuron dysfunction was named amyotrophic lateral sclerosis (ALS) by Charcot and Joffroy (Ringel, et al 1993). Jean-Martin Charcot first characterized the disease in 1874, naming the illness Amyotrophic lateral sclerosis (ALS) (Swash, 2001). In USA, ALS or Lou Gehrig's disease are terms used to describe all forms of the disease, whatever the combination of upper and lower motor neuron involvement (Ringel, et al 1993). ALS is now a term which classifies the most common form of the illness and is often used synonymously with MND (Swash, 2001). In the UK the umbrella term motor neuron disease (MND) is more common. MND is a disease of middle to late life with a mean age of onset of 58 years, (Ringel, et al 1993).