[The hippocampus in patients with different forms of senile dementia].

Using cytoarchitectonic and quantitative techniques the hippocampus and dentate fascia of the adult human brain were studied in normal subjects and in patients with senile dementia and Alzheimer's disease. The examination elucidated the peculiarity of the hippocampal structures, identified characteristics of the changes in the structural organization of the hippocampus and dentate fascia and established the severest atrophy in the H2 field of the hippocampus and a dramatic narrowing of the width of the dentate fascia. The data obtained are analyzed.