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.
Imaging case study of the month: Abnormal enhancement of the membranous labyrinth in a case of relapsing polychondritis
Jan 01, 1998; Relapsing polychondritis is a rare disease of unknown cause, first described in 1923 by JakschWartenhorst.1 It is characterized...