abnormal palate development abnormal primary palate development MPheno.ontology abnormal primary palate primordia any anomaly in the formation of the part of the shelf separating the oral and nasal cavities that is formed during early embryonic development from the medial nasal processes which derive from the frontonasal process; these merge with each other and with the bilateral maxillary processes to form the upper lip and the primary palate MP:0009654 abnormal primitive palate morphology