has part has part has_part characteristic of part of has modifier abnormal epithalamus morphology abnormal habenula morphology MP:0004082 Note that the habenula term originally denoted the stalk of the pineal gland, but now refers to the habenular nucleus, a neighboring group of neurons in the epithalamus. abnormal habenular nucleus morphology MPheno.ontology any structural anomaly in 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 morphology abnormal habenula