hippocampus morphology trait hippocampus fimbria morphology trait Trait.ontology fimbra hippocampus morphology trait hippocampus fimbra mrophology hippocampal fimbria morphology trait EFO:0009402 VT:0003005 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.