Abnormal Nervous System Morphology Neuron Degeneration Nerve Degeneration Provide source for additional info. http://www.neurodegenerationresearch.eu/about/what/ MP:0003224 Multiple disease entities such as alzhiemers disease, parkinsons disease , huntington's disease and amylotrophic lateral sclerosis Nerve Degenerations Sufficient Neuron Degenerations Multifactorial causes such as program cell death, genetic mutations, protein misfolding and intracellular mechanisms Usually in the elderly persons. Aging associated with most disorders A retrogressive impairment of function or destruction of the functional cells of the nervous system that receive, conduct, and transmit impulses. SCDO:0000802