abnormal septum pellucidum morphology abnormal septum pellucidum size 2013-06-10T16:14:10Z MP:0012005 MPheno.ontology abnormal lateral septum size abnormal septum lucidum size anomaly in the size of the thin, triangular, vertical membrane separating the anterior horns of the left and righ of the septum, which has strong projections to hypothalamic and midbrain regions and receives projections from the hippocampus and amygdala csmith