abnormal dentate gyrus morphology decreased dentate gyrus size 2013-12-04T22:39:39Z MP:0012460 MPheno.ontology csmith reduced dentate gyrus reduced dentate gyrus size reduced size 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