hippocampus morphology trait hippocampus fimbria morphology trait Any measurable or observable characteristic related to the shape, structure, color, or pattern 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. EFO:0009402 Trait.ontology VT:0003005 fimbra hippocampus morphology trait hippocampal fimbria morphology trait hippocampus fimbra mrophology