AMYOTROPHIC LATERAL SCLEROSIS

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WordNet Dictionary

	Definition:	[n] thickening of tissue in the motor tracts of the lateral columns and anterior horns of the spinal cord; results in progressive muscle atrophy that starts in the limbs

	Synonyms:	ALS, Lou Gehrig's disease

	See Also:	induration, monogenic disease, monogenic disorder, sclerosis

Medical Dictionary

	Definition:	A disease of unknown cause affecting nerve cells in the brain and spinal cord, leading to muscular wasting.

Biology Dictionary

	Definition:	This is the most frequent form of the progressive nerve disorders affecting the brain, brain stem and spinal cord, usually appearing when a person is 50-70 years old. It is sometimes associated with dementia and Parkinson's disease.