abnormal hippocampal commissure morphology increased hippocampal commissure size MP:0008224 MPheno.ontology enlarged hippocampal commissure enlarged triangular subcallosal plate of commissural fibers resulting from the converging of the right and left fornix bundles which exchange numerous fibers and which curve back in the contralateral fornix to end in the hippocampus of the opposite side increased size of commissure fornicis increased size of commissure hippocampi increased size of commissure of fornix increased size of delta fornicis increased size of hippocampal commissure increased size of hippocampus commissure increased size of ventral hippocampal commissure increased size of vhc