Introduction.- Material and Methods.- Structure, Functions, and Connections: Preliminary Remarks.- Structure.- Cornu Ammonis (Hippocampus Proper).- Gyrus Dentatus (Fascia Dentata, Gyrus Involutus).- Structures Joined to the Hippocampus.- Functions and Connections.- Learning and Memory.- Emotional Behavior.-Motor Control.- Hypothalamus.- Comparative Studies.- Anatomy: Preliminary Remarks.- Hippocampal Body.- Intraventricular Part.- Extraventricular or Superficial Part.- Relations with Adjacent Structures.- Hippocampal Head.- Intraventricular Part.-Extraventricular or Uncal Part.- Relations of the Uncus with Adjacent Structures.- Hippocampal Tail.- Intraventricular Part.-Extraventricular Part.- Relations with Adjacent Structures.- General Features. Vascularization: Superficial (Leptomeningeal) Blood Vessels.- Superficial Hippocampal Arteries.- Superficial Hippocampal Veins.- Intrahippocampal (Deep) Blood Vessels.-Intrahippocampal Arteries.- Intrahippocampal Veins.- Hippocampal Head.- Vascular Network. Coronal, Sagittal and Axial Sections of the Hippocampus Showing its Relationships with the Surrounding Structures (after intravascular india ink injection).-Sectional Anatomy and Magnetic Resonance Imaging: Coronal Sections.- Sagittal Sections.- Axial Sections.- References.- Index.