abnormal septum of telencephalon morphology abnormal septum pellucidum morphology 2013-06-10T16:14:10Z MP:0012004 MPheno.ontology abnormal lateral septum morphology abnormal septum lucidum morphology any structural anomaly of the thin, triangular, vertical membrane separating the anterior horns of the left and right lateral ventricles of the septum, which has strong projections to hypothalamic and midbrain regions and receives projections from the hippocampus and amygdala csmith