The redundancies and overlap of function built into our nervous systems ensure that we can perceive and interact with the environment for many decades. In a sense, aging of this organ system actually begins before birth, as apo-ptosis, a form of programmed cell death, occurs in the brain, essentially carving out the structures that will remain. This normal dying off of neurons continues throughout life. When brain apoptosis fails, disease results. The brains of individuals who die of schizophrenia
(a) Parasympathetic neurons
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