The lateral (outer) aspect of the canal is known as the fundus. The fundus is subdivided by two thin crests of bone to form three separate canals, through which course the facial and vestibulocochlear nerve branches.
The outer side of the canal is called the fundus. The fundus is a region within the canal that is subdivided by two bony crests to form three separate canals, through which the facial and vestibulocochlear nerve branches travel.