abnormal hippocampus morphology abnormal dentate gyrus morphology MP:0000812 MPheno.ontology abnormal area dentata morphology abnormal dentate gyrus of hippocampal formation morphology abnormal fascia dentata morphology any structural anomaly of one of two interlocking gyri of the hippocampus formation that contains granule cells, which project to the pyramidal cells and interneurons of the CA3 region of the ammon gyrus dentate gyrus dysplasia