[Pathological structure of blood vessels of cerebral cortex in Alzheimer's disease in comparison with various other types of mental retardation (oligophrenia, Down's syndrome)].

The characteristic features of the brain cortex architectonics were studied and compared in Alzheimer's disease, oligophrenia and Down's disease. Some analogous alterations were established to be characteristic of all the three forms of pathology. On this basis the role is discussed of congenital disturbances of the angioarchitectonics in both mental retardation and dementia development.