Koerner septum

Last revised by Yuranga Weerakkody on 26 Aug 2021

The Koerner septum, also known as the petrosquamous lamina or septum, is a thin bridge of bone which divides the petrous and squamous portion of the mastoid air cells at the level of the mastoid antrum. It represents the continuation and persistence of the petrosquamous suture 2.

It is commonly eroded by middle ear cholesteatomas.

History and etymology

It is named after Otto Körner (1858-1935), a German otorhinolaryngologist, described the septum petrosquamosum in 1926 3.

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