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The cochlear and vestibular branches of cranial nerve VIII separate according to this schema and terminate in the inner ear.

posterior superior - superior vestibular area (contains superior division of vestibular nerve).anterior inferior - cochlear nerve area (contains cochlear nerve).anterior superior - facial nerve area (contains facial nerve and nervus intermedius).Although there are three osseous canals, the fundus is conceptually divided more commonly into four quadrant areas according to the four major nerve branches of the inner ear: House) then divides the upper passage into anterior and posterior sections. The falciform crest first divides the meatus into superior and inferior sections a vertical crest (Bill's bar, named by William F. 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 lateral (outer) aspect of the canal is known as the fundus. The canal which comprises the internal auditory meatus is short (about 1 cm) and runs laterally into the bone.

Its outer margins are smooth and rounded. It is located inside the posterior cranial fossa of the skull, near the center of the posterior surface of the petrous part of the temporal bone. The opening to the meatus is called the porus acusticus internus or internal acoustic opening.