abnormal dorsal telencephalic commissure morphology abnormal hippocampal commissure morphology MP:0008221 MPheno.ontology abnormal commissure fornicis abnormal commissure hippocampi abnormal commissure of fornix abnormal delta fornicis abnormal hippocampus commissure abnormal ventral hippocampal commissure abnormal vhc any structural anomaly 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