The Mouse Adult Gross Anatomy Ontology and Mammalian Phenotype Ontology are downloaded weekly from the Mouse Genome Informatics databases at Jackson Laboratories (ftp://ftp.informatics.jax.org/pub/reports/index.html). For more information about these ontologies, see the MGI Publications Page at http://www.informatics.jax.org/mgihome/other/publications.shtml.
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