Fundus of internal acoustic meatus

Case contributed by A.Prof Frank Gaillard

Diagrammatic view of the fundus of the right internal acoustic meatus.
1. Crista falciformis
2. Area facialis, with (2’) internal opening of the facial canal
3. Ridge separating the area facialis from the area cribrosa superior
4. Area cribrosa superior, with (4’) openings for nerve filaments
5. Anterior inferior cribriform area, with (5’) the tractus spiralis foraminosus, and (5’’) the canalis centralis of the cochlea
6. Ridge separating the tractus spiralis foraminosus from the area cribrosa media
7. Area cribrosa media, with (7’) orifices for nerves to saccule
8. Foramen singulare

This diagram is taken from Gray's Anatomy 20th US edition which has now lapsed into the public domain (

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Case information

rID: 36077
Published: 14th May 2015
Last edited: 26th Oct 2015
System: Head & Neck
Inclusion in quiz mode: Excluded

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