has part has part has_part characteristic of part of has modifier abnormal hard palate morphology abnormal palatal rugae morphology abnormal rugae of palate morphology abnormal rugae palatinae morphology any structural anomaly in the series of transverse folds (ridges) of the mucosa located on the anterior third part of the secondary (hard) palate of most mammalian species; rugae are present on each side of the median palatal raphe and behind the incisive papillae, but their number and arrangement are species specific; together with the teeth and the tongue, rugae take part in mastication by helping to sense, hold and mash the food; rugae harbor various types of intraepithelial sensory structures (such as Merckel cells, corpuscular endings and free nerve endings), and play a sensory role when the food is pressed by the tongue against the hard palate MPheno.ontology abnormal ruga of palate morphology abnormal impressiones rugales morphology abnormal palatal ridge morphology MP:0009652 abnormal plicae palatinae transversae morphology abnormal plica palatinae transversae morphology abnormal palatine fold morphology abnormal palatine rugae morphology abnormal plica palatina transversa morphology abnormal transverse palatine folds set abnormal ruga palatina morphology abnormal transverse palatine fold morphology abnormal transverse palatine ridge morphology morphology abnormal transverse palatine fold