has part has part has_part characteristic of part of has modifier abnormal diencephalon morphology abnormal subthalamus morphology abnormal ventral thalamus any structural anomaly of the anterior part of the diencephalon that lies between the thalamus, hypothalamus, and tegmentum of the mesencephalon, including subthalamic nucleus, zona incerta, the fields of Forel, and the nucleus of ansa lenticularis ventral thalamus dysplasia MPheno.ontology subthalamus dysplasia MP:0000834 morphology abnormal ventral thalamus