The progressive loss of structure and function of neurons, leading to cognitive and motor decline, as seen in Alzheimer's and Parkinson's diseases.
From Greek 'neuron' (nerve) + Latin 'degenerare' (to become unlike one's race, deteriorate). Nerves deteriorating.
Neurodegeneration is the brain slowly losing its neurons — it's behind Alzheimer's, Parkinson's, and other devastating diseases that steal memory and movement.
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