abnormal forebrain morphology absent forebrain 2013-10-09T15:20:00Z MP:0012136 MPheno.ontology absence of the anterior of the three primary divisions of the developing chordate brain or the corresponding part of the adult brain (in vertebrates, includes especially the cerebral hemispheres, the thalamus, and the hypothalamus and especially in higher vertebrates is the main control center for sensory and associative information processing, visceral functions, and voluntary motor functions) absent prosencephalon csmith forebrain agenesis missing forebrain missing prosencephalon prosencephalon agenesis