| Namespace | MPheno.ontology | Obsolete | false |
| description | absence of the dense, pyramid-shaped portion of the temporal bone that is wedged in at the base of the skull between the sphenoid and occipital bones; directed medially, forward, and a little upward, it presents a base, an apex, three surfaces, and three angles, and houses in its interior, the components of the inner ear; the petrous portion is among the most basal elements of the skull and forms part of the endocranium |
