Near the center of the posterior surface of the temporal bone is a large orifice, the internal acoustic meatus (or internal auditory meatus), the size of which varies considerably; its margins are smooth and rounded, and it leads into a short canal, about 1 cm. in length, which runs lateralward.

It transmits the facial and acoustic nerves and the internal auditory branch of the basilar artery.

The opening is named the "Porus acusticus internus". ()

See also

• Ear canal

External links

• Diagram of Porus acusticus internus
• Diagram of Porus acusticus internus

Foramina of the skull