The bony case of the internal and middle ear, consisting of the petrous portion of the temporal bone. ... Origin: oto-+ G. Kranion, cranium ... (05 Mar 2000) ... 
(o″to-kra´ne-әm) the area of the petrous part of the temporal bone surrounding the osseous labyrinth. adj., otocra´nial., adj.
Type: Term Pronunciation: ō′tō-krā′nē-ŭm Definitions: 1. The bony case of the internal and middle ear, consisting of the petrous portion of the temporal bone.
otocranium 1. The portion of the petrous part of the temporal bone that houses the internal ear. 2. The petrous part and the mastoid process of the temporal bone, containing the hearing apparatus.