Koerner septum
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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
Otto Körner (1858-1935), a German otorhinolaryngolistotorhinolaryngologist, described the septum petrosquamosum in 1926 3.
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