abnormal habenula morphology decreased habenula size decreased habenular nucleus size MP:0012482 reduced size of the group of nuclei that makes up the small eminence on the dorsomedial surface of the thalamus, just in front of the dorsal commissure on the lateral edge of the habenular trigone reduced habenular nucleus csmith reduced habenular nucleus size 2013-12-04T22:39:39Z MPheno.ontology