Porus acusticus internus

Last revised by Tim Luijkx on 23 Jul 2019

The porus acusticus internus (plural: pori acustici interni), often merely referred to as porus acusticus, is the medial opening of the internal acoustic canal through which the facial nervevestibulocochlear nerve and labyrinthine artery pass1

Masses that arise from within the internal acoustic meatus, the vast majority being vestibular schwannomas, often result in widening of the porus acusticus sometimes referred to as trumpeted internal acoustic meatus sign.


The term internus should, strictly speaking, be appended to porus acusticus to distinguish it from the porus acusticus externus that represents the lateral bony opening of the external acoustic meatus 1

The internal acoustic meatus or canal refers to the entire tubular canal from the porus acusticus to its lateral fundus. 

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