| Namespace | MPheno.ontology | Obsolete | false |
| description | any structural anomaly of a cytoarchitectural subregion of the Ammon's horn region of the hippocampal formation consisting primarily of pyramidal neurons; the pyramidal neurons of CA1 receive projections from pyramidal neurons of CA3 via the Schaffer collaterals and send outputs to the entorhinal cortex and to the subiculum |