Unlike the external acoustic meatus, the internal acoustic meatus does not transmit sound waves. It instead transmits the facial and vestibulocochlear nerves and the labyrinthine artery (an internal auditory branch of the basilar artery). The facial nerve travels through the facial canal, eventually exiting the skull at the stylomastoid foramen.
The opening of the meatus is called the porus acusticus internus, or its English translation, the internal acoustic opening.
Nonsyndromic Isolated Unilateral Cochlear Nerve Aplasia Without Narrow Internal Auditory Meatus: A Previously Overlooked Cause of Unilateral Profound Deafness in Childhood
Nov 01, 2005; Objectives: Juvenile or adolescent unilateral profound sensorineural deafness (worldwide prevalence, 0.1% to 0.2%) has been...