has part has part has_part characteristic of has modifier abnormal hippocampal commissure morphology absent hippocampal commissure MP:0008223 absent vhc absent hippocampus commissure absent ventral hippocampal commissure MPheno.ontology absent delta fornicis absence of the 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 absent commissure of fornix absent commissure hippocampi absent commissure fornicis abnormal absent hippocampal commissure