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 of the thin plate of bone which separates the middle ear (tympanic) cavity from the dura of the middle cranial fossa and forms the roof of the middle ear cavity; it is formed in part by the petrous portion of the temporal bone, and the squamous portion of the temporal bone