This occurs when normal tissue, an organ or even the whole body wastes because the constituent cells die. Undernourishment, disease, injury, lack of use or AGEING may cause atrophy. Muscular atrophy occurs in certain neurological diseases such as POLIOMYELITIS or MUSCULAR DYSTROPHY. The ovary (see OVARIES) atrophies at the MENOPAUSE. (See also MUSCLES, DISORDERS OF.)