[The pathogenesis of inadequate cerebral circulation in the aged].

A physiopathologically oriented classification is proposed for cerebral circulatory insufficiency to cover forms caused by intra- and extracranial vascular disease, and those of cardiac and non-cardiac extravascular origin. The aetiopathogenetic aspects of the matter are discussed, and some clinical pictures of particular geriatric interest are described. Lastly, attention is given to the dysmetabolically induced instances of cerebral distress that are often observed in the aged.