abnormal septum of telencephalon morphology abnormal septal nucleus morphology 2014-03-19T15:46:27Z MP:0012682 MPheno.ontology abnormal septal nuclei any structural anomaly of the groups of neural nuclei situated in the septal region which have afferent and cholinergic efferent connections with a variety of forebrain and brainstem areas including the hippocampus, the lateral hypothalamus, the tegmentum, and the amygdala csmith