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Neurodegenerative disease (Greek νέυρο-, néuro-, "nerval" and Latin dēgenerāre, "to decline" or "to worsen") is a condition in which cells of the brain and spinal cord are lost. The brain and spinal cord are composed of neurons that do different functions such as controlling movements, processing sensory information, and making decisions. Aside from a small number of neural stem cells that are created daily, cells of the brain and spinal cord are not readily regenerated en mass, so excessive damage can be devastating. Neurodegenerative diseases result from deterioration of neurons which over time will lead to neurodegeneration and disabilities resulting from this. They are crudely divided into two groups according to phenotypic effects, although these are not mutually exclusive: