Spinal muscular atrophy/Definition

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Spinal muscular atrophy [r]: A group of disorders marked by progressive degeneration of motor neurons in the spinal cord, resulting in weakness and muscular atrophy, usually without evidence of injury to the corticospinal tracts.

This definition is at least in part based on: Anonymous (2023), Spinal muscular atrophy (English). Medical Subject Headings. U.S. National Library of Medicine.