Internal auditory canal
In humans, the internal auditory canal is about 1-2 cm in length. Aside from the vestibular nerve (responsible for balance) and cochlear nerve (responsible for hearing), the facial nerve also runs through this tube.
The IAC opens to the inside of the cranial cavity, near the center of the posterior surface of the temporal bone, and the opening is called internal acoustic opening''. At the other end of IAC are the openings for the vestibulocochlear and facial nerves.