Definition: one of the two interlocking gyri composing the hippocampus, the other being the dentate gyrus. Based on cytoarchitectural features, Ammon horn can be divided into region I [TA] (regio I cornus ammonis [TA]), region II [TA] (regio II cornus ammonis [TA]), region III [TA] (regio III cornus ammonis [TA]), and region IV [TA] (regio IV cornus ammonis [TA]).
Synonym(s): cornu ammonis
[G. Ammon, the Egyptian deity Amun]
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