A curved elevation of GRAY MATTER extending the entire length of the floor of the TEMPORAL HORN of the LATERAL VENTRICLE (see also TEMPORAL LOBE). The hippocampus proper, subiculum, and DENTATE GYRUS constitute the hippocampal formation. Sometimes authors include the ENTORHINAL CORTEX in the hippocampal formation.

Synonyms: Subiculums, Propers, Hippocampus, Formation, Hippocampal, Proper, Hippocampus, Schaffer Collaterals, Horn, Ammon's, Horn, Ammon, Hippocampus Propers, Collaterals, Schaffer, Ammon Horn, Ammon's Horn, Hippocampal Formation, Formations, Hippocampal, Cornu Ammonis, Hippocampal Formations, Schaffer Collateral, Subiculum, Ammons Horn, Hippocampus Proper, Collateral, Schaffer, Hippocampus