part of part of hard palate mucosa of hard palate rugal fold transverse palatine fold hard palate palatal rugae rugae palatinae FMA:75652 plicae palatinae transversae hard palate ruga EMAPA:35638 rugae of palate set of transverse palatine folds palatine rugae transverse palatine folds set Any of the the series of transverse folds (ridges) of the mucosa located on the anterior third part of the secondary (hard) palate of most mammalian species. plica palatina transversa this class refers to the singular and the FMA class refers to the set. In future this class may be split. palatine fold palatal rugae A masticatory vestige on the hard palate; one of several irregular, sometimes branching, crests of soft tissue that radiate from the region of the incisive papillae at their most anterior parts and extend a slight distance backward, crossing the hard palate and reaching laterally for variable distances. ruga palatina transverse palatine ridge ruga of palate transverse palatine folds UBERON:0008799 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[MP] impressiones rugales