abnormal hippocampal fimbria morphology decreased hippocampal fimbria size csmith reduced hippocampal fimbria MP:0012466 MPheno.ontology reduced size of the flattened band of efferent fibers arising from the subiculum and medial border of the hippocampus, which then thickens to form the fornix and fibers of the hippocampal commissure reduced hippocampal fimbria size 2013-12-04T22:39:39Z