Alois Alzheimer (1864-1915). In 1906, German psychiatrist and neuropathologist Alois Alzheimer made a complete clinical and pathological description of presenile dementia, which came to be known as Alzheimer's disease, a progressive condition in which nerve cells in the brain degenerate. Inset image showing a brain with a piece missing, a conceptual illustration of Alzheimer's disease.
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Album / Science Source / Spencer Sutton/Jessica Wilson